Techtanium MP 50 User manual

Installation & Operating Instructions
Models MP 20, MP 32, MP 40 & MP 50
TOTHEINSTALLER:Thismanualis
thepropertyoftheownerand
mustbeaffixednearthewater
heaterforfuturereference.

TOTHEOWNER:Thiswaterheater
shouldbeinspectedannuallybya
qualiedServiceAgency.

Improper installa�on, adjustment, altera�on,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or addi�onal informa�on, consult
a qualied Installer or Service Agency.
Do not store or use gasoline or other amma‐
ble vapors and liquids in the vicinity of this or
any other appliance. Installa�on and service
must be performed by a qualied Installer or
Service Agency.
WARNING
FOR YOUR
SAFETY
INDIRECT WATER HEATERS
Installation & Operating Instructions
Models MP 20, MP 32, MP 40 & MP 50
TOTHEINSTALLER:Thismanualis
thepropertyoftheownerand
mustbeaffixednearthewater
heaterforfuturereference.

TOTHEOWNER:Thiswaterheater
shouldbeinspectedannuallybya
qualiedServiceAgency.

Improper installa�on, adjustment, altera�on,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or addi�onal informa�on, consult
a qualied Installer or Service Agency.
Do not store or use gasoline or other amma‐
ble vapors and liquids in the vicinity of this or
any other appliance. Installa�on and service
must be performed by a qualied Installer or
Service Agency.
WARNING
FOR YOUR
SAFETY
INDIRECT WATER HEATERS
Installation & Operating Instructions
Models MP 20, MP 32, MP 40 & MP 50
TOTHEINSTALLER:Thismanualis
thepropertyoftheownerand
mustbeaffixednearthewater
heaterforfuturereference.

TOTHEOWNER:Thiswaterheater
shouldbeinspectedannuallybya
qualiedServiceAgency.

Improper installa�on, adjustment, altera�on,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or addi�onal informa�on, consult
a qualied Installer or Service Agency.
Do not store or use gasoline or other amma‐
ble vapors and liquids in the vicinity of this or
any other appliance. Installa�on and service
must be performed by a qualied Installer or
Service Agency.
WARNING
FOR YOUR
SAFETY
INDIRECT WATER HEATERS
NEW JERSEY HEADQUARTERS • 439 MAIN ROAD, TOWACO, NJ 07082
PHONE: [phone] • WEBSITE: WWW.DHTNET. COM
Manufacturers and Designers Since 1938

CONTENTS

I SAFETY
II
PRODUCT SELECTION
III PERFORMANCE
RATINGS/SPECS
IV
INSTALLATION/PIPING
V WIRING
VI MAINTENANCE
VII WARRANTY


I SAFETY

The warranty on this water heater is in effect only when
the water heater is installed and operated in accordance
with these instructions. The manufacturer of this water
heater will not be liable for any injury or property
damage resulting from failure to comply with these
instructions.

WARNING! This water heater must be installed strictly in
accordance with the
instructions enclosed, and local
electrical, fuel and building codes. It is possible that
connections to the water heater or the water heater
itself may develop leaks. IT IS THEREFORE IMPERA-
TIVE that the water heater be installed so that
any
leakage of the tank or related water piping is directed to
an adequate drain in such a way that it cannot damage
the building, furniture, carpeting, adjacent areas, lower
floors of the structure or other property subject to
water damage. This is
particularly important if the

finished flooring or carpeted surfaces. DHT CANNOT BE
HELD LIABLE for damage caused by water from
the
water
heater, pressure relief valve, or related fittings.
Closets without drains and carpeted areas are examples
of unsuitable locations for any water heater. Select a
location as
centralized within the piping system as
possible. The heater should be located in an area
not
subject to freezing temperatures in any location
selected. It is recommended that a suitable drain pan be
installed under the water heater. This pan shall be a
minimum of 50mm (2 in.) deep and have a diameter
that
is a minimum of 50mm (2 in.) greater than the diameter
of the water heater. Suitable piping shall connect the
drain pan to a properly operating floor drain.


Relief Valve R e qu i r e m e n t s

C a u t i on : To reduce the risk of excessive pressures and
temperatures in this water heater, install temperature
and pressure protective equipment required by local
codes. It should be no less than a combination tempera -
ture and pressure relief valve certified by a nationally
recognized testing laboratory that maintains periodic
inspection of production of listed equipment or material-
als, as meeting the latest edition of ANSI Z21.22:
Requirements for Relief Valves and
Automatic Gas
Shut-off Devices for Hot Water Supply Systems.
This
valve must be marked with a maximum set pressure not
to exceed the marked MAXIMUM working pressure of the
water heater (150 PSI). Install the valve into an opening
provided and marked for this purpose in the water
heater, and orient
it or provide tubing so that any
discharge from the valve will exit only within 6 inches
above, or any distance below the structural floor and
cannot contact any live electrical part. The discharge
opening must not be blocked or reduced in size under
any circumstances. The end of the relief pipe opening
should terminate near a floor drain or other suitable
location not subject to blocking or freezing. DO NOT
thread, plug or cap the relief pipe
opening.


D A N G E R






HOT
BURN
• Water temperatures over 125ºF can cause severe burns
instantly or death from scalds.
• Children, disabled, and elderly are at the highest risk
of
being scalded.
• See
instruction manual before setting temperature at water
heater.
• Feel water before bathing or
showering.
• Temperature
limiting valves are available, see manual.




NOTICE
The Techtanium Indirect-fired water heater is deemed to be used in a "commercial
setting" if at any time the unit is operated at a temperature over 150ºF. Refer to warranty
for additional information.
I Safety
Contents
2


II PRODUCT SE L E C T I O N /
PERFORMANCE

1. The following g u i d e l i n e s apply to residential systems only. For commercial or institutional installations contact
the factory directly for assistance.

2. Determine the quantity of domestic hot water required. Factors to consider:

a. E s t i m a t e t y p i c a l peak hour demand. Determine the general time of day (morning, noon, evening) when the
most hot water is used. Use chart below to determine potential maximum usage.


E s t i m a t e of Peak D o m es t i c H o t W a t e r Usage

Average Gallons
of
Use Hot Water per Usage

Shower 20
Bath
20
Shaving
2
Hands and Face Washing
4
Hair Shampoo
4
Hand Dish Washing
4
Automatic Dish Washing 14
Food Preparation
5
Wringer Clothes Washer
26
Automatic Clothes Washer 32
Times Used
During
One
Hour
x
x
x
x
x
x
x
x
x
x
Times Used During
One
Hour

= x
= x
= x
= x
= x
= x
= x
= x
= x
= x

Total Peak Hour Demand
=



b. E s t i m a t e unusual peak draw demand. Whirlpool baths, hot tubs, and multiple head showers require large
quantities
of hot water in a short period of time. Contact fixture manufacturer for quantity of water required.
Generally speaking, these circumstances can only be met with larger storage volumes.

c.
D o m es t i c Water Te m p e r a t u r e . Most residential usage will be satisfied with 119ºF water, the temperature
setting recommended by the Consumer Product Safety Commission. Some applications s u c h as laundry and
dishwashers may require a higher temperature.

Ratings can be improved by increasing Techtanium
thermostat setting and using a mixing valve to temper the
hot water to the proper temperature. When temperatures greater than 119ºF are required, use a mixing valve at
the outlet of the wate
r
heate
r
o
r
anti-scald fittin
g
s at
p
oint of use.
III Specifications and Performance
MP Model Units 20 32 40 50
Tank Capacity Gallons 21.2 31.7 42.3 52.9
Minimum Recommend Power Btu/Hr. 75,000 95,000 115,000 140,000
Maximum Working Pressure P.S.I. 150 150 150 150
Maximum Temperature Degrees F 194 194 194 194
Weight (empty) Pounds 74.8 99 112.2 136.4
Weight (full) Pounds 251.4 363.1 464.6 577
II Product Selection
3

Connection Diagram
MP 20 MP 32 MP 40 MP 50
A 22.4" 22.4" 22.4" 22.4”
B 31.1" 39½" 47.9" 56¾"
C 27.6" 36" 44.4" 53.2"
Boiler Supply
Boiler Return
Drain
Thermometer
Cold Water Inlet
Hot Water Outlet
T&P Relief Valve
Drain Valve
Boiler Supply Boiler Return
Front of Tank
Tank Thermostat
(located under cover)
Dimensions
A
B
C
4

Pressure Drop Table
Model Number
Primary Flow Rate
Unit
5 GPM 8 GPM 12 GPM
MP 20 1.2 2.9 6.2 / hd
MP 32 1.6 3.8 8.0 / hd
MP 40 1.6 3.6 7.6 / hd
MP 50 1.8 4.2 8.8 / hd
Pressure Drop Graph
-
2.0
4.0
6.0
8.0
10.0
5 GPM 8 GPM 12 GPM
Primary Flow Rate
Head Loss FT/HD
Pressure Drop Graph
MP 20
MP 32
MP 40
MP 50
5
50
32
40
20

Performance Data MP 20
ConnuousDrawRangsBasedUponBoiler’sAbilitytoMaintain180ºF
 ModelMP20
CirculatorFlowGPM55881212
DHWTemperature120ºF140ºF120ºF140ºF120ºF140ºF
Boiler
Heang
Capacityin
Btu/Hr.
Output
45,00076567656 
60,00095699569 
75,0001168311683 
95,0001208613495142101
115,0001208613495156111
140,000  13495156111
165,000    168119
195,000     
Performance Data MP 32
ConnuousDrawRangsBasedUponBoiler’sAbilitytoMaintain180ºF
 ModelMP32
CirculatorFlowGPM55881212
DHWTemperature120ºF140ºF120ºF140ºF120ºF140ºF
Boiler
Heang
Capacityin
Btu/Hr.
Output
45,0001067810678 
60,0001349713497 
75,000162116162116 
95,000168120188134198141
115,000168120188134219155
140,000  188134219155
165,000    236167
195,000     
6
Rangsbasedupondomesccoldwaterenteringtemperatureof58ºF

Performance Data MP 40
ConnuousDrawRangsBasedUponBoiler’sAbilitytoMaintain180ºF
 ModelMP40
CirculatorFlowGPM55881212
DHWTemperature120ºF140ºF120ºF140ºF120ºF140ºF
Boiler
Heang
Capacityin
Btu/Hr.
Output
45,0001108211082 
60,000138101138101 
75,000166120166120 
95,000172124192138202145
115,000172124192138223159
140,000  192138223159
165,000    240171
195,000     
Performance Data MP 50
ConnuousDrawRangsBasedUponBoiler’sAbilitytoMaintain180ºF
 ModelMP50
CirculatorFlowGPM55881212
DHWTemperature120ºF140ºF120ºF140ºF120ºF140ºF
Boiler
Heang
Capacityin
Btu/Hr.
Output
45,0001179111791 
60,000142108142108 
75,000167125167125 
95,000201148201148201161
115,000201148231169236186
140,000  231169252198
165,000    252198
195,000     
7
Rangsbasedupondomesccoldwaterenteringtemperatureof58ºF

TheLocaonoftheTechtaniumheater:

Locatetheheatersothatthereiseasyaccesstothecontrol,piping,valves,drainandheaterforfuture
servicingandmaintenance.Theheateristobekeptinanareawhereitisnotexposedtofreezingtem‐
peratures.

Also,theheatermustbelocatedinanareawherealeak(eg.fromthepipingorfings,fromanytem‐
peratureandreliefvalvedischarge,orfromthetankitself),willnotcausepersonalharmordam‐
agethesurroundingarea.Thetankshouldbeinstalledinanareawithafloordrainorinapansuitable
forwaterheaters.

ReadtheInstallaonandOperangInstruconsmanualthoroughly.Followrecommendedpipingand
wiringdiagrams.Uponcomplenginstallaon,fillthetankwithwater.Whilefillingitleaveahot
waterfaucetopenunlasteadystreamofwaterisflowing.Then,shutthefaucetandcheckforany
leaksthroughouttheenresystem.

TheTankshouldbeinstalledinanareawithafloordrainorinapansuitableforwaterheaters.
DHTwillnotbeheldliableforanydamagescausedbywaterleakage.Thefloororareawherethe
tankisinstalledmustbecapableofsupporngthetankwhenfilledwithwater.(Refertothe
SpecificaonsTableonthepage3)


FOR YOUR SAFETY: Do not store or use gasoline or other flammable vapors or liquids in the vicinity of
this or any other appliance. Controls on this appliance could ignite vapors causing an explosion.
IV Installation & Piping
General:

a.Allplumbingmustbeinaccordancewiththerequirementsoftheauthorityhavingjurisdicon.
b.Useboththreadtapeandpipedopeonallmechanicalconnecons.
c.Zonevalve(ifused)andcirculatormustbesizedtoprovideminimumflowratespecifiedinthetable
totheright,FlowSpecificaons.Use1inchnominalcoppertubingforflowsgreaterthan7GPMbe‐
tweentheboilerandheatexchanger.SeethetablesonFriconLoss.Pointofemphasis:usingazone
valvewithoutafullboremaycausehighpressuredropwhichwilladverselyaffectperformance.
Useextremecarewhenselecngzonevalve.
d.Allpipingmustbeadequatelysupported.
e.Allowforthermalexpansion.
f.DielectricUnions(recommended)‐usedtoelectricallyisolatetheTechtaniumtankfromtheconnect‐
eddomescwaterpiping.Thishelpstominimizethepossibilityofcorrosion
damage.
8

Flow S p e c i f i c a t i on s
Flow Specifications
Friction Loss per 100’ of Tubing (psi)
Friction Loss Allowance for Copper Fittings (ft. of tubing)
9
ModelNumberRecommended
FlowRate
HeatExchanger
PressureDrop(.hd.)
DomescWater
ConneconSizes
MP‐205GPM1.23/4”
MP‐328GPM3.83/4”
MP‐4012GPM7.63/4”
MP‐5012GPM8.83/4”
TubingTypeFlowRate10GPMFlowRate15GPM
TypeK3.1psi6.5PSI
TypeL2.7psi5.7psi
TypeM2.3psi4.7psi
FingWroughtCast
90ºElbow14
45ºElbow12
Tee—Run1/21/2
Tee‐Branch35
Longradius90ºElbow2‐
180ºBend2‐
GateValve‐ 1

IV Installation/Piping
(cont’d)
A
BC
D
E
F
G
H
Legend

ABallValve—Typical

BDielectricUnion—Suggested

CTemperature&PressureReliefValve

DHeatTrapLoop—Suggested

EThermosta�cMixingValve–Suggested

FHighTemperatureOutlet

GMixedTemperatureOutlet

HExpansionTankinColdWaterSupply


Note: For drawing clarity, addiƟonal
isolaƟon valves and other accessories have
been omiƩed. Follow normal piping
pracƟces when installing tank.
Domes�cWater:

A.Installisola�onvalvebetweenthewatersupplyand
thecoldwaterinletofthetankforeaseofservice.
B.Installingaheattrapinthedomes�chotwateroutlet
pipingwillimproveenergyefficiencyandreducepip‐
ingheatloss.
C.AThermosta�cMixingValveisrecommendedand
mayberequiredbylocalcodes.Thevalvewillblend
thetankoutputwaterwithcoldwatertoachievea
moreconstantmixedtemperature.Theriskofscald‐
ingisnoteliminatedbyuseofamixingvalve.Refer
totheinstalla�oninstruc�onsprovidebythemixing
valvemanufacturerforproperinstalla�on.
D.ExpansionTank:Whenaback‐owdeviceor“no‐
return”valveisinstalledinthepipingsystemaTher‐
malExpansionTankdesignedforuseinadomes�c
hotwatersystemwillberequired.Installthetankin
thecoldwaterpipingclosetothetankbetweenthe
tankandtheback‐owdevice.(seepipingdiagram)
RefertoThermalExpansionTankmanufacturer’slit‐
eratureforsizingandinstalla�oninforma�on.
E.VacuumBreaker:DHTrecommendsthatavacuum
breakerbeinstalledonthedomes�cpipingtothe
heater.Thevacuumbreakerprotectstheheaterin
theeventthatthetankpressurefallsbelowatmos‐
phericpressure.
F.Temperature&PressureReliefValve:(T&P)Installa
T&Preliefvalve(longelementtype)intotheseparate
tappingdesignatedfortheT&Pvalve.Installtemper‐
atureandpressureprotec�veequipmentrequiredby
localcodes,butnolessthanacombina�ontempera‐
tureandpressurereliefvalvecer�edasmee�ngthe
requirementsforreliefValveandAutoma�cShutoff
DevicesforHotWatersystems,ANSIZ21.22,bya
na�onallyrecognizedtes�nglaboratorythatmain‐
tainsperiodicinspec�onoflistedequipmentormate‐
rials.Thevalvemustbeoriented,providedwithtub‐
ingorotherwiseinstalledsothatdischargecanexit
onlywithinsix(6)inchesabove,oratanydistance
below,thestructuraloor,andcannotcontactany
electricalpart.Thevalvemustbepipedtoanarea
wheredischargewillnotcausepersonalinjuryor
damagethesurroundingarea.
WARNING
Install a T&P relief valve with a rated capacity equal
or greater that the output of the energy source.
Removal of the T&P Valve or failure to replace the
valve will release the manufacturer from any claim
which might result from excessive
temperatures and pressures
10
IV Installation/Piping
(cont’d)
A
BC
D
E
F
G
H
Legend

ABallValve—Typical

BDielectricUnion—Suggested

CTemperature&PressureReliefValve

DHeatTrapLoop—Suggested

EThermosta�cMixingValve–Suggested

FHighTemperatureOutlet

GMixedTemperatureOutlet

HExpansionTankinColdWaterSupply


Note: For drawing clarity, addiƟonal
isolaƟon valves and other accessories have
been omiƩed. Follow normal piping
pracƟces when installing tank.
Domes�cWater:

A.Installisola�onvalvebetweenthewatersupplyand
thecoldwaterinletofthetankforeaseofservice.
B.Installingaheattrapinthedomes�chotwateroutlet
pipingwillimproveenergyefficiencyandreducepip‐
ingheatloss.
C.AThermosta�cMixingValveisrecommendedand
mayberequiredbylocalcodes.Thevalvewillblend
thetankoutputwaterwithcoldwatertoachievea
moreconstantmixedtemperature.Theriskofscald‐
ingisnoteliminatedbyuseofamixingvalve.Refer
totheinstalla�oninstruc�onsprovidebythemixing
valvemanufacturerforproperinstalla�on.
D.ExpansionTank:Whenaback‐owdeviceor“no‐
return”valveisinstalledinthepipingsystemaTher‐
malExpansionTankdesignedforuseinadomes�c
hotwatersystemwillberequired.Installthetankin
thecoldwaterpipingclosetothetankbetweenthe
tankandtheback‐owdevice.(seepipingdiagram)
RefertoThermalExpansionTankmanufacturer’slit‐
eratureforsizingandinstalla�oninforma�on.
E.VacuumBreaker:DHTrecommendsthatavacuum
breakerbeinstalledonthedomes�cpipingtothe
heater.Thevacuumbreakerprotectstheheaterin
theeventthatthetankpressurefallsbelowatmos‐
phericpressure.
F.Temperature&PressureReliefValve:(T&P)Installa
T&Preliefvalve(longelementtype)intotheseparate
tappingdesignatedfortheT&Pvalve.Installtemper‐
atureandpressureprotec�veequipmentrequiredby
localcodes,butnolessthanacombina�ontempera‐
tureandpressurereliefvalvecer�edasmee�ngthe
requirementsforreliefValveandAutoma�cShutoff
DevicesforHotWatersystems,ANSIZ21.22,bya
na�onallyrecognizedtes�nglaboratorythatmain‐
tainsperiodicinspec�onoflistedequipmentormate‐
rials.Thevalvemustbeoriented,providedwithtub‐
ingorotherwiseinstalledsothatdischargecanexit
onlywithinsix(6)inchesabove,oratanydistance
below,thestructuraloor,andcannotcontactany
electricalpart.Thevalvemustbepipedtoanarea
wheredischargewillnotcausepersonalinjuryor
damagethesurroundingarea.
WARNING
Install a T&P relief valve with a rated capacity equal
or greater that the output of the energy source.
Removal of the T&P Valve or failure to replace the
valve will release the manufacturer from any claim
which might result from excessive
temperatures and pressures
10
IV Installation/Piping
(cont’d)
A
BC
D
E
F
G
H
Legend

ABallValve—Typical

BDielectricUnion—Suggested

CTemperature&PressureReliefValve

DHeatTrapLoop—Suggested

EThermosta�cMixingValve–Suggested

FHighTemperatureOutlet

GMixedTemperatureOutlet

HExpansionTankinColdWaterSupply


Note: For drawing clarity, addiƟonal
isolaƟon valves and other accessories have
been omiƩed. Follow normal piping
pracƟces when installing tank.
Domes�cWater:

A.Installisola�onvalvebetweenthewatersupplyand
thecoldwaterinletofthetankforeaseofservice.
B.Installingaheattrapinthedomes�chotwateroutlet
pipingwillimproveenergyefficiencyandreducepip‐
ingheatloss.
C.AThermosta�cMixingValveisrecommendedand
mayberequiredbylocalcodes.Thevalvewillblend
thetankoutputwaterwithcoldwatertoachievea
moreconstantmixedtemperature.Theriskofscald‐
ingisnoteliminatedbyuseofamixingvalve.Refer
totheinstalla�oninstruc�onsprovidebythemixing
valvemanufacturerforproperinstalla�on.
D.ExpansionTank:Whenaback‐owdeviceor“no‐
return”valveisinstalledinthepipingsystemaTher‐
malExpansionTankdesignedforuseinadomes�c
hotwatersystemwillberequired.Installthetankin
thecoldwaterpipingclosetothetankbetweenthe
tankandtheback‐owdevice.(seepipingdiagram)
RefertoThermalExpansionTankmanufacturer’slit‐
eratureforsizingandinstalla�oninforma�on.
E.VacuumBreaker:DHTrecommendsthatavacuum
breakerbeinstalledonthedomes�cpipingtothe
heater.Thevacuumbreakerprotectstheheaterin
theeventthatthetankpressurefallsbelowatmos‐
phericpressure.
F.Temperature&PressureReliefValve:(T&P)Installa
T&Preliefvalve(longelementtype)intotheseparate
tappingdesignatedfortheT&Pvalve.Installtemper‐
atureandpressureprotec�veequipmentrequiredby
localcodes,butnolessthanacombina�ontempera‐
tureandpressurereliefvalvecer�edasmee�ngthe
requirementsforreliefValveandAutoma�cShutoff
DevicesforHotWatersystems,ANSIZ21.22,bya
na�onallyrecognizedtes�nglaboratorythatmain‐
tainsperiodicinspec�onoflistedequipmentormate‐
rials.Thevalvemustbeoriented,providedwithtub‐
ingorotherwiseinstalledsothatdischargecanexit
onlywithinsix(6)inchesabove,oratanydistance
below,thestructuraloor,andcannotcontactany
electricalpart.Thevalvemustbepipedtoanarea
wheredischargewillnotcausepersonalinjuryor
damagethesurroundingarea.
WARNING
Install a T&P relief valve with a rated capacity equal
or greater that the output of the energy source.
Removal of the T&P Valve or failure to replace the
valve will release the manufacturer from any claim
which might result from excessive
temperatures and pressures
10

Watertemperatureover125ºF
cancausesevereburnsinstantlyor
deathfromscalds.

Children,disabledandelderlyareat
highestriskofbeingscalded.

Seeinstruconmanualbeforeseng
temperatureatwaterheater.

Feelwaterbefore
bathingorshowering.

Temperaturelimingvalvesare
available,seemanual.
AllwiringmustbedoneinaccordancewithNa
onal,Stateandlocalcodes.AdheretotheNa
onalElectricCodeANSI/NFPA701990inthe
absenceofanyothercodes.

Powermustbeshutobeforeinstallingorservic
ingtheheater.Aseparateshutoswitchshould
beinstalledtosupportfutureservicingoran
emergencyshutdown.Theenreheangsystem
shouldhaveitsowndesignatedelectricalcircuit.

TheTechtaniumheateroperatesinmuchthe
samewayasanaddionalheangzone,either
ulizingthesamecirculatorashouseholdheang
oritsowncirculator.Theheatertemperatureis
maintainedbytheuseofanimmersiontypeaq
uastat.Theaquastatisinstalledintotheim
mersionwellontheheater.

Theaquastatoperatesinmuchthesamewayasa
thermostat.Whenthetemperaturefallsinside
thetankthesetofcontactsmake(close)and
whenthetemperaturerisesthecontactsbreak
(open).

Theaquastatshouldbeedintotheboilersys
temandcontrols.Whenthetankcallsforheatthe
aquastatcontactscloseandsignaltheboilercon
trols,allowingtheboilertomaintaintemperature
andproperoperaonofthetankcirculator.

DHTrecommendstheuseofaprioritycontrolto
helptheboilermaintaindesiredtemperatureand
sasfythetank'sBTUrequirements.

TheTechtaniumheaterrecoveryrangsarebased
ontheboiler'sabilitytomaintain180degrees
Fahrenheit.Itisimportantthattheinstaller,
plumberorheangtechnicianresponsiblefor
installingtheheater,makecertainthatthe
boilercapacity(BTU)isadequatetosasfythe
heater'sBTUrequirements.
11
V Wiring

Wiring:Thethermostatisratedfor15amps.FollowthewiringinstruconsinseconVpages
11to16inthismanual.TerminalsC&2(thetwobrownwires)arenormallyopenandclose
(make)ontemperaturedecrease.Similartomostwaterheateraquastatsorcontrols.Thecon
tactsopen(break)ontemperaturerise–whenthetankreachesthesettemperature.Connect
systemwirestowiringblocklocatedundercover.
Auxiliarycontacts:TerminalsC&1(purple&brown)forsolar,heangorotherapplicaonsare
normallyclosedandopen(break)ontemperaturedecrease.Thisoperaonisoppositemost
waterheatersandshouldonlybeusedforauxiliaryequipment.
Setthetemperaturebyrotangthescrewdriverslottoalignwiththedesiredseng.Please
refertotheinstruconmanualforcauonaryinformaonregardingwatertemperaturesafety.
Itisimportanttochecktheoutputtemperatureofanywaterheaterwithathermometerto
insurethatthesengiscorrect.
Inaccordancewithlocalandnaonalplumbingcodesitishighlyrecommendedthatathermo
stacmixingvalvebeusedtoprotecttheuserfrompotenalhazardduetospikesintempera
ture.
Note:
For use with a tank sensor, remove the tank thermostat capillary (black coated) and insert the
sensor recommended by your control or boiler manufacturer (usually 10 K ohms) into the well.
Wiring and Thermostat Setting
Important Notes
CAUTION: When using the oponal wall bracket (verƟcal posiƟon only) insure that the wall and
fasteners are capable of supporng the weight of the tank when lled with water (see page 3, Secon
III for weights). Refer to the bracket installaon instrucons included with the oponal bracket.
Wiring and Thermostat Setting
16
Brown
Wires
Connect wires here
Wiring: The thermostat is rated for 15 amps. Follow the wiring instrucons in secon Vpages
11 to 16 in this manual. Terminals C & 2 (the two brown wires) are normally open and close
(make) on temperature decrease. Similar to most water heater aquastats or controls. The con
tacts open (break) on temperature rise –when the tank reaches the set temperature. Connect
system wires to wiring block located under cover.
Auxiliary contacts: Terminals C & 1 (purple & brown) for solar, heang or other applicaons are
normally closed and open (break) on temperature decrease. This operaon is opposite most
water heaters and should only be used for auxiliary equipment.
Set the temperature by rotang the screwdriver slot to align with the desired seng. Please
refer to the instrucon manual for cauonary informaon regarding water temperature safety.
It is important to check the output temperature of any water heater with a thermometer to
insure that the seng is correct.
In accordance with local and naonal plumbing codes it is highly recommended that a thermo
stac mixing valve be used to protect the user from potenal hazard due to spikes in tempera
ture.
Note:
For use with a tank sensor, remove the tank thermostat capillary (black coated) and insert the
sensor recommended by your control or boiler manufacturer (usually 10 K ohms) into the well.
Wiring and Thermostat Setting
Important Notes
CAUTION:Whenusingtheoponalwallbracket(verƟcal posiƟon only) insurethatthewalland
fastenersarecapableofsupporngtheweightofthetankwhenlledwithwater(seepage3,Secon
IIIforweights).Refertothebracketinstallaoninstruconsincludedwiththeoponalbracket.
Wiring and Thermostat Setting
12
Brown
Wires
Connect wires here
Wiring: The thermostat is ratedfor 15 amps. Follow the wiring instruc ons in sec on V pages
11 to 16 in this manual. Terminals C & 1 (the two brown wires) are normally open and close
(make) on temperature decrease. Similar to most water heater aquastats or controls. The con
tacts open (break) on temperature rise – when the tank reaches the set temperature. Connect
system wires to wiring block located under cover.
Auxiliary contacts: Terminals C & 1 (purple & brown) for solar, hea ng or other applica onsare
normally closed and open (break) on temperature decrease. This opera on is opposite most
water heaters and should only be used for auxiliary equipment.
Set the temperature by rota ng the screwdriver slot to align with the desired se ng. Please
refer to the instruc on manual for cau onary informa on regarding water temperature safety.
It is important to check the output temperature of any water heater with a thermometer to
insure that the se ng is correct.
In accordance with local and na onal plumbing codes it is highly recommended that a thermo
sta c mixing valve be used to protect the user from poten al hazard due to spikes in tempera
ture.
Note:
For use with a tank sensor, remove the tank thermostat capillary (black coated) and insert the
sensor recommended by your control or boiler manufacturer (usually 10 K ohms) into the well.
Wiring and Thermostat Setting
Important Notes
CAUTION: When using the op onal wall bracket (vercal posi on only) insure that the wall and
fasteners are capable of suppor ng the weight of the tank when lled with water (see page 3, Sec on
III for weights). Refer to the bracket installa on instruc ons included with the op onal bracket.
Wiring and Thermostat Setting
16
Brown
Wires
Connect wires here
Wiring: The thermostat is ratedfor 15 amps. Follow the wiring instruc ons in sec on V pages
11 to 16 in this manual. Terminals C & 2 (the two brown wires) are normally open and close
(make) on temperature decrease. Similar to most water heater aquastats or controls. The con
tacts open (break) on temperature rise – when the tank reaches the set temperature. Connect
system wires to wiring block located under cover.
Auxiliary contacts: Terminals C & 1 (purple & brown) for solar, hea ng or other applica onsare
normally closed and open (break) on temperature decrease. This opera on is opposite most
water heaters and should only be used for auxiliary equipment.
Set the temperature by rota ng the screwdriver slot to align with the desired se ng. Please
refer to the instruc on manual for cau onary informa on regarding water temperature safety.
It is important to check the output temperature of any water heater with a thermometer to
insure that the se ng is correct.
In accordance with local and na onal plumbing codes it is highly recommended that a thermo
sta c mixing valve be used to protect the user from poten al hazard due to spikes in tempera
ture.
Note:
For use with a tank sensor, remove the tank thermostat capillary (black coated) and insert the
sensor recommended by your control or boiler manufacturer (usually 10 K ohms) into the well.
Wiring and Thermostat Setting
Important Notes
CAUTION: When using the op onal wall bracket (vercal posi on only) insure that the wall and
fasteners are capable of suppor ng the weight of the tank when lled with water (see page 3, Sec on
III for weights). Refer to the bracket installa on instruc ons included with the op onal bracket.
Wiring and Thermostat Setting
16
Brown
Wires
Connect wires here
Purple
Wire
Connect wires here
Normally
Closed
1
2
G
C
Normally
Open
Ground
Common
Brown
Wire
Wiring: The thermostat is rated for 15 amps. Follow the wiring instrucons in secon V pages
11 to 16 in this manual. Terminals C & 1 are normally open and close (make) on temperature
decrease. Similar to most water heater aquastats or controls. The contacts open (break) on
temperature rise – when the tank reaches the set temperature. Connect system wires to wir-
ing block located under cover.
Auxiliary contacts: Terminals C & 2 for solar, heang or other applicaons are normally closed
and open (break) on temperature decrease. This operaon is opposite most water heaters and
should only be used for auxiliary equipment.

Tankless Coil Boiler Application - Priority Figure 3a.
13
Opera�on:Whenanythermostatcallsfor
heat,theboilerisgivenasignaltostart.The
appropriatecirculatorisenergizedonlywhen
theboilertemperatureisabovethelowlimit.
PriorityOpera�on:WhenZone6is
switchedtotheprioritysengandisacvat
ed,allotherzoneswillstopoperaonunl
zone6issased.WhenZone6isnot
switchedtopriority,allzoneswilloperate
independently.
JumperPlacement:REMOVEthejumper
betweenterminalsZCandZR.Connecttermi
nalZCtoZCterminalontheaquastatcontrol.
ConnectterminalZRtoZRterminalonthe
aquastatcontrol.Conrmpolarityiscon
sistentbetweentheboileraquastatandthe
switchingrelay.
Powerinput:Connect120voltaspower
inputtoterminalsNandH.Neutralwireto
terminalN.HotwiretoterminalH.

Cold Start Boiler Application - Priority Figure 3b.
14
Opera�on:Whenanythermostatcallsfor
heat,appropriatecirculatorisenergizedand
theisolatedendswitch(XX)willstartthe
boiler.
PriorityOpera�on:WhenZone6is
switchedtotheprioritysengandisacvat
ed,allotherzoneswillstopoperaonunl
zone6issased.WhenZone6isnot
switchedtopriority,allzoneswilloperate
independently.
JumperPlacement:Thejumpershould
beplacedbetweenterminalsZCandZR.Con
necttheisolatedendswitchtotheaquastat
ontheboiler
Powerinput:Connect120voltaspower
inputtoterminalsNandH.Neutralwireto
terminalN.HotwiretoterminalH.

Wiring Diagrams
15

Wiring Diagrams
16

VI Maintenance
Toensureefficientandsafeoperaon,DHTrecom‐
mendstheservicingoftheheaterbyacompetentser‐
vicetechnician.
LimeorSedimentBuildup(Every6months)
Toreducethebuildupoflimeorsedimentitisrecom‐
mendedthatthetankbeflushedeverysixmonths.
1. Drainthetankthroughthedrainvalveatthe
boomofthetankunlthewaterisclear.
2. Inspectthetankforanydepositsoflimeorsediment.
3. Removelime,scaleordepositsusingcarenotto
damagethetanklining.
Temperature&PressureReliefValve(Every12
months)
1. BeforemanuallytesngtheT&Pvalve,makesure
thevalveispipedinamannerthatwillnotcause
harmordamageanysurroundingarea.
2. Manuallyopenthereliefvalveandallowittoflush
outanylimeorsedimentdeposits.
3. Allowthereliefvalvetosnapshut,makingsurethe
sealclosesproperly.
Magnesium‐An‐CorrosionAnodes(Nolongerthan
every12months)
Removaloftheanodes:
1. Shutoffallpowertotheheater.
2. Closethedomesccoldwatersupplyvalve.
3. Openthehouseholdhotwatertaps.
4. Aachahosetothedrainvalvelocatedatthe
boomoftheheaterandallowtheheatertodrain.
5. Unscrewtheanodes.
EXAMINETHEANODESANDREPLACEIFTHEY SHOW
SIGNSOF DETERIORATION.
6. ReplacementoftheAnodes‐‐TheuseorP.T.F.E.tape
isrecommendedtoensurewaterghtconneconofthe
anodes.
Failure to inspect the anodes may result in
premature failure of the heater and could
void the warranty.
OwnerInformaon
ModelNumber:_______________________________
SerialNumber:_______________________________
InstallaonDate:______________________________
Wholesaler:_________________________________________________________________________________
OriginalOwnerName:_________________________________________________________________________
Address:____________________________________________________________________________________
City:_______________________________________State:__________________________________________
ZipCode:__________________________________AddionalInformaon:____________________________
____________________________________________________________________________________________
____________________________________________________________________________________________
17

INDIRE C T W A T E R HE A TER S
DIVERSIFIED HEAT TRANSFER, INC.
LIMITED WARRANTY FOR DIVERSIFIED HEAT TRANSFER, INC. TECHTANIUM™ INDIRECT-
FIRED WATER
HEA TER
Your Techtanium™ indirect-fired water heater is protected by
these warranties
. T hese warranties are applicable to original
residential or commercial purchasers
only.
THE FOLLOWING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN LIEU OF ANY AND ALL OTHER WARRANTIES,
EXPRESS OR
IMPLIED , INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, AND ANY
OBLIGA TION , LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACT OR TORT, WHETHER OR NOT
ARISING FROM DIVERSIFIED HEAT TRANSFER’S NEGLIGENCE, ACTUAL OR
IMPUTED .
THE REMEDIES OF THE ORIGINAL PURCHASER SHALL BE LIMITED TO THOSE PROVIDED HEREIN TO THE EXCLUSION OF ANY OTHER
REMEDIES
INCL UDING WITHOUT LIMITATION, SPECIAL, INDIRECT , INCIDENTAL AND/OR CONSEQUENTIAL DAMAGES INCLUDING,
BUT NOT LIMITED TO
PROPERTY DAMAGE, L OST PROFIT, OR DAMAGES ALLEGED TO HAVE BEEN CAUSED BY ANY FAILURE OF
DIVERSIFIED HEAT TRANSFER TO MEET ANY OBLIGATION UNDER THIS
AGREEMENT INCLUDING THE OBLIGATION TO REPAIR AND
REPLACE SET FORTH BEL
OW .
NO AGREEMENT VARYING OR EXTENDING T H E FOREGOING WARRANTIES, REMEDIES, OR THIS LIMITATION WILL BE BINDING UPON
DIVERSIFIED
HEA T TRANSFER UNLESS IN WRITING AND SIGNED BY A DULY AUTHORIZED OFFICER OF DIVERSIFIED HEAT
TRANSFER. DIVERSIFIED HEAT TRANSFER DOES
NO T ASSUME OR AUTHORIZE ANY OTHER PERSON TO ASSUME FOR IT ANY OTHER
LIABILITY IN CONNECITON WITH THE SALE OF ITS
PRODUCT S.
THIS WARRANTY EXTENDS ONLY TO THE FIRST (ORIGINAL) RETAIL PURCHASER OF THE TANK AND ONLY WHILE THE TANK IS
OWNED BY
THA T PURCHASER AND REMAINS AT ITS ORIGINAL LOCATION. CHANGE IN OWNERSHIP OR RELOCATION OF THE
TANK SHALL FOREWITH TERMINATE
THIS WARRANTY WITHOUT FURTHER NO TICE .
WARRANTY COVERAGE FOR RESIDENTIAL
USAGE - 7
YEARS
The Warranties listed in this section shall apply to Diversified Heat Transfer Techtanium™ indirect-fired water heaters used in a
residential setting
b y original purchasers only . A “residential setting ” as used herein shall mean usage either (a) in a single family
dwelling in which the original
c onsume r purchaser of the indirect-fired water heater resides on a permanent basis or (b) in a
multiple family dwelling provided that such Techtanium
indir ec t-fir ed water heater services only one family unit in a multiple
family dwelling; provided that the term “residential setting
” shall not include any usage of the Techtanium indirect-fired water
heater above 150 degrees
F ahrenheit.
During the specified warranty period of the indirect-fired water heat e r , Diversified Heat Transfer Inc ., will repair or repl ac e , at its
option, without
char ge , any indirect-fired water heater having a defect or malfunction that results in a water leak from the outside
jack et , inner tank, or heat exchanger as a result of normal use and ser vic e . It is expressly agreed between Diversified Heat Transfer
and the original residential purchaser that repair or replacement is
the exclusive and sole remedy of the original pur chaser .
Any claim under this warranty must be verified by an authorized Diversified Heat Transfer (also referred to as DHT ) repr esen tativ e : if
the claim is found to be v alid , DHT will repair or replace the tank as set forth herein, within a reasonable time after verification. If DHT
chooses
in its discretion to repair any indirect-fired water heater for which there is a valid warranty claim, DHT shall provide parts that
are
compatible with the subject indirect-fired water heat e r , which parts need not be identical to the original. If DHT chooses , in its
discretion, to replace any indirect-fired water heater for which there is a valid warr
ant y claim, DHT shall replace the subject indirect-
fired water heater with the
same model or , if such model is not a vailable , with a model which is, in DHT ’ s reasonable judgment , the
nearest compatible model available at the time of
r eplacement. Removal of the Techtanium water heater and replacement with a
If Diversified Heat Transfer is unable to repair or replace or otherwise comply with its liability under these warranties , after a
reasonable number
of att empts , then the original consumer purchaser’s sole and exclusive remedy for such breach shall be either
a replacement product or a full refund of
the purchase price (exclusive of freight , labor and installation), as determined by
Diversified Heat
T r ansfer .
If the original purchaser cannot provide proof of purchase than DHT may request proof of residency dating back to the date of
manufacture of the
tank. In such case the warranty period will begin from the date of manufacture as determined by the tank serial
number .
WARRANTY COVERAGE FOR COMMERCIAL
USAGE - (THREE YEARS)
VII Warranty
18
different brand will fully invalidate this warranty coverage.

REPLACEMENT TANK - WARRANTY RESIDENTIAL OR COMMERCIAL APPLIC A TION
For either a residential or commercial application, the following applies to both when a replacement tank is provided for a ta nk found to be under warr ant y .
The replacement tank warranty assumes the remaining warranty period left from the original tank pur chased .
WHAT IS NOT COVERED BY EITHER OF THESE W ARR ANTIES
These warranties are void and shall not apply under the following circumstanc es:
1. The Techtanium™ water heater was not installed or repaired by a heating contractor whose principal occupation is the sale, installation and repair of
plumbing , heating and/or air conditioning equipment.
2. These warranties cannot be considered as a guarantee of workmanship of an installer connected with the installation of the Techtanium water heat e r , or
as imposing on Diversified Heat Transfer liability of any nature for unsatisfac t or y performance as result of faulty workmanship in the installation or r epair
which liability is expressly disclaimed
.
3. The failure or malfunction results from improper or negligent operation, abuse , misuse or maintenance or unauthorized alt er ation.
4.Malfunctions resulting fr om, or repairs necessitated b y , uses of the indirect-fired water heater for purposes other than that for which it was designed , or
resulting from flood , fir e , wind , lightning , freezing or any other natural disaster or ac t of G o d , an ac t of destruc tion, theft or accident.
5. The original serial number on the indirect-fired water heater or component thereof cannot be readily det ermined .
6. Any indirect-fired waterheater is installed in a setting containing any type of water sof t ener system that is not installed and maintained in acc or danc e
with the manufac tur er ’ s specifications .
7. The Techtanium indirect-fired water heater is used for non-potable applications such as pool or process heating .
8. The failure or malfunction results from failure to keep the tank full of potable wat e r , free to circulate at all times and with the tank free of damaging wat er
sediment or scale
deposits .
9. Components of an indirect-fired water heater which are not def ec tiv e , but must be replaced during the warranty period as a result of reasonable w ear
and t ear .
10. Techtanium indirect-fired water heaters which are repaired or altered without prior written approval of Diversified Heat Transfer so as to affect adv ersely
their reliabilit y .
11. Diversified Heat Transfer Techtanium™ indirect-fired water heaters installed outside of the United States and C anada.
12. S e r vic e calls not involving any malfunction or defects and maintenance in the ordinary c ourse .
13. Components of an indirect-fired water heater which are not manufactured expressly for Diversified Heat Transfer; such components are subject only to
those warranties , if any , given by their manufac tur ers . Diversified Heat Transfer does not adopt and has no responsibility for those warranties .
14. Any Techtanium tank that does not have installed a new temperature and pressure relief valve bearing the American Society of Mechanical Engineers
(A.S.M.E.) listing at the time of installation.
FURTHER LIMITATIONS OF WARRANTIES AND REMEDIES
These warranties give you specific legal rights , and you may also have other rights which vary from state to stat e . Some states do not allow the exclusion or
limitation of incidental or consequential damages , so this limitation or exclusion may not apply to y ou .
These are the only written warranties applicable to Diversified Heat Transfer Techtanium™ indirect-fired water heaters manufactured for and sold b y
Diversified Heat Transfer. Diversified Heat Transfer neither assumes nor authorizes anyone to assume for it any other obligation or liability in connection with
said Techtanium indirect-fired water heat ers .
This warranty does not cover expenses or labor for disassembly, removal, shipment reassembly or reinstallation; the original purchaser will be
responsible for such c o sts .
Diversified Heat Transfer’s performance under these warranties may be contingent on shipment of components or equipment from suppliers . Diversified
Heat Transfer shall not be liable for any failure or delay in delivery due to any cause beyond its control including without li mitation, strik e , labor st oppage , a
natural disaster (such as
ear thquak e , flood , fire or storm), political insurrection or the unavailability of c omponents , equipment or supplies .
MAKING A WARRANTY CL AIM
TO FILE A CLAIM UNDER THESE WARRANTIES CONTACT DIVERSIFIED HEAT TRANSFER INC. AT THIS ADDRESS:
439 MAIN ROAD, TOWACO, NEW JERSEY 07082 OR CALL DIVERSIFIED HEAT TRANSFER AT [phone] AND ASK FOR CUSTOMER SERVICE.
At the time a claim is filed , the original purchaser must present a copy of the original sales r e c eipt , installation bill, proof of delivery or equivalent
documents evidencing both ownership of the Techtanium™ indirect-fired water heater and installation in the dwelling or commercial property owned by th e
original pur chaser
This warranty is to be governed by and construed in accordance with the laws of the State of New York without regard to the principles of conflict of laws .
DIVERSIFIED HEAT TRANSFER RESERVES THE RIGHT TO CHANGESPECIFICATIONS OR DISCONTINUE MODELS WITHOUT NO TICE.
VII Warranty
19

INDIRECT WATER HEATERS
INDIRECT WATER HEATERS
17ºî
MP 20 6ºî
MP 32 14Ωî
MP 40 22Ωî
MP 50 30 Ωî
Before aempng awall mounted installaon of the MP tank insure that the selected wall will have the ability to withstand the
full tank weight as specied below.
Securely fasten the brackets according to the model and dimensions in the diagrams below. When fastening the brackets to the
wall make sure to use appropriate fasteners capable of supporng the full tank weight as specied below.
Please note that the tank may only be installed in the upright vercal posion.
Follow the piping and wiring instrucons found in the installaon manual.
Optional Wall Mount Installation Instructions
Models MP 20, MP 32, MP 40, MP 50
WARNING
Tank may only be installed in the upright vercal posion
MP Model Units 20 32 40 50
Weight (empty) Pounds 74.8 99 112.2 136.4
Weight (full) Pounds 251.4 363.1 464.6 577
17ºî
MP 20 6ºî
MP 32 14Ωî
MP 40 22Ωî
MP 50 30 Ωî
Before aempng awall mounted installaon of the MP tank insure that the selected wall will have the ability to withstand the
full tank weight as specied below.
Securely fasten the brackets according to the model and dimensions in the diagrams below. When fastening the brackets to the
wall make sure to use appropriate fasteners capable of supporng the full tank weight as specied below.
Please note that the tank may only be installed in the upright vercal posion.
Follow the piping and wiring instrucons found in the installaon manual.
Optional Wall Mount Installation Instructions
Models MP 20, MP 32, MP 40, MP 50
WARNING
Tank may only be installed in the upright vercal posion
MP Model Units 20 32 40 50
Weight (empty) Pounds 74.8 99 112.2 136.4
Weight (full) Pounds 251.4 363.1 464.6 577
17ºî
MP206ºî
MP3214Ωî
MP4022Ωî
MP5030Ωî
BeforeaempngawallmountedinstallaonoftheMPtankinsurethattheselectedwallwillhavetheabilitytowithstandthe
fulltankweightasspeciedbelow.
Securelyfastenthebracketsaccordingtothemodelanddimensionsinthediagramsbelow.Whenfasteningthebracketstothe
wallmakesuretouseappropriatefastenerscapableofsupporngthefulltankweightasspeciedbelow.
Pleasenotethatthetankmayonlybeinstalledintheuprightvercalposion.
Followthepipingandwiringinstruconsfoundintheinstallaonmanual.
Optional Wall Mount Installation Instructions
Models MP 20, MP 32, MP 40, MP 50
WARNING
Tankmayonlybeinstalledintheuprightvercalposion
MP Model Units 20 32 40 50
Weight (empty) Pounds 74.8 99 112.2 136.4
Weight (full) Pounds 251.4 363.1 464.6 577
Installation & Operating Instructions
Models MP 20, MP 32, MP 40 & MP 50
TO THE INSTALLER: This manual is
the property of the owner and
must be affixed near the water
heater for future reference.
TO THE OWNER: This water heater
should be inspected annually by a
qualied Service Agency.
Improper installa�on, adjustment, altera�on,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or addi�onal informa�on, consult
a qualied Installer or Service Agency.
Do not store or use gasoline or other amma‐
ble vapors and liquids in the vicinity of this or
any other appliance. Installa�on and service
must be performed by a qualied Installer or
Service Agency.
WARNING
FOR YOUR
SAFETY
INDIRECT WATER HEATERS
Installation & Operating Instructions
Models MP 20, MP 32, MP 40 & MP 50
TO THE INSTALLER: This manual is
the property of the owner and
must be affixed near the water
heater for future reference.
TO THE OWNER: This water heater
should be inspected annually by a
qualied Service Agency.
Improper installa�on, adjustment, altera�on,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or addi�onal informa�on, consult
a qualied Installer or Service Agency.
Do not store or use gasoline or other amma‐
ble vapors and liquids in the vicinity of this or
any other appliance. Installa�on and service
must be performed by a qualied Installer or
Service Agency.
WARNING
FOR YOUR
SAFETY
INDIRECT WATER HEATERS
NEW JERSEY HEADQUARTERS • 439 MAIN ROAD, TOWACO, NJ 07082
PHONE: [phone] • WEBSITE: WWW.DHTNET. COM
Manufacturers and Designers Since 1938