Viessmann EHA Series Instruction manual

Technical Data Manual
5696 674 - 03 02/2018
Model Nos. and pricing: see Price List
Vitocell 300-H
EHA Series
Horizontal indirect-fired domestic hot water storage
tank made of high-grade stainless steel
VITOCELL 300-H
EHA Series
Indirect-fired domestic hot water storage tank
42 to 119 USG (160 to 450 L)
Product may not be exactly as shown

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Benefits
Product Information
Fully hygienic, efficient and economical domestic hot
water production with DHW tanks of high-grade stainless
steel – horizontal version.
Benefits at a glance:
HCorrosion-resistant tank of high-grade SA 240-316 Ti
stainless steel offers a long service life.
H Fully hygienic due to high quality homogeneous
stainless steel surfaces.
H The high-alloy material is immune to cracking or
peeling. The tank stays hygienic and requires only
minimum service.
H The entire water content is heated by a 1¼” (32 mm)
diameter stainless steel heat exchanger surface which
extends to the bottom of the tank.
H Certified to CSA Low Lead Content Certification
Program; including US Safe Drinking Water Act,
NSF/ANSI 372 as well as other applicable US State
requirements.
H The positioning of the tubular heat exchanger coil
further ensures that 82 to 97% of the tank volume
can be drawn at constant water temperature.
H The stainless steel heat exchanger coil is self-venting
towards the top and self-draining towards the bottom,
therefore not susceptible to reduced heat transfer due
to air lock or sediment deposits.
H Standby losses minimized by 2¼” (58 mm) highly
effective, foamed-in-place HCFC-free insulation.
H Easy transport into mechanical room due to low
weight and compact construction.

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Cross Section
Product Information
Inspection port/
clean-out opening
Tank is constructed of
high-grade SA 240-316
Ti stainless steel
Non-finned, stainless steel,
tubular heat exchanger coil
extends to tank bottom – the
entire water volume is heated
ensuring no cold spots where
bacteria growth could occur
2¼” (57 mm) thick
foamed-in-place
HCFC-free insulation
Product may not be exactly as shown

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Technical Data
Technical Data
For domestic hot water heating applications which
utilize hot water heating boilers
Suitable for heating systems with:
H max. working pressure on heat exchanger
side up to 220 psig at 392°F (200°C)
H Only for 92 and 119 USG (350 and 450 L)
saturated steam 15 psig at 250°F (121°C)
H max. working pressure on DHW water side
of up to 150 psig at 210°F (99°C)
Storage capacity USG (L) 42 (160) 53 (200) 92 (350) 119 (450)
Recovery rates*1
with a temperature rise
water from 50 to 140°F
(10 to 60°C) and heating
water supply temperature of
. . . . . . at the supply flow
rate stated below
194°F MBH (kW)
(90°C) GPH (L/h)
96 (28)
126 (482)
113 (33)
150 (568)
239 (70)
318 (1204)
280 (82)
372 (1410)
176°F MBH (kW)
(80°C) GPH (L/h)
78 (23)
108 (396)
85 (25)
114 (430)
174 (51)
234 (877)
212 (62)
282 (1066)
158°F MBH (kW)
(70°C) GPH (L/h)
51 (15)
66 (258)
58 (17)
78 (292)
116 (34)
156 (585)
133 (39)
180 (671)
Supply flow rate
for the recovery rates stated GPM (m3/h) 13.2 (3.0) 22.0 (5.0) 22.0 (5.0) 22.0 (5.0)
Recovery rates *5
with a temperature rise of
the domestic hot water from
50 to 113°F (10 to 45°C)
a steam pressure of . . . .
and a max. steam velocity
of 164 ft/s (50 m/s)
7bpsig MBH (kW)
GPH (L/h)
-- -- 283 (83)
539 (2039)
283 (83)
539 (2039)
15 psig MBH (kW)
GPH (L/h)
-- -- 358 (105)
682 (2580)
358 (105)
682 (2580)
Standby losses*2 MBH/24h 4.0 4.2 6.0 6.6
Overall dimensions
Overall depth
Overall width
Width without enclosure
Overall height
in. (mm)
in. (mm)
in. (mm)
in. (mm)
42a(1072)
25a(640)
--
25c(654)
48c(1236)
25a(640)
--
25c(654)
62b(1590)
32c(830)
30a(768)*3*4
31 (786)
65 (1654)
35c(910)
32 (810)*4
35 (886)
Weight
Tank with insulation lb (kg) 168 (76) 185 (84) 379 (172) 421 (191)
Heating water content
(heat exchanger pipe coil) USG (L) 1.8 (7) 2.1 (8) 3.4 (13) 4.2 (16)
Heat exchanger surface area ft2(m2) 9.36 (0.87) 9.7 (0.9) 18.3 (1.7) 22.6 (2.1)
Connections
Heating water supply/return
Domestic cold/hot water
Temp. and press. relief valve
7"(male thread)
7”(male thread)
7”(male thread)
1
c
c
1
c
1
1a
1a
1
1a
1a
1a
*1 When planning for the recovery rate as stated or calculated, allow for the corresponding circulation pump.
The stated recovery rate is only achieved when the rated output of the boiler is equal to or greater than that
stated under “Recovery rates”. Please also refer to the corresponding sizing chart at the end of this manual.
*2 Measured values are based on a room temperature of 68ºF (20ºC) and a domestic hot water temperature of
149ºF (65ºC) and can vary by ±5%.
*3 To overcome mechanical room access problems, the front panel with thermometer and side panels can be
removed, the adjustable feet unscrewed, and the Vitocell 300-H turned on its side.
*4 This is the net width of the Vitocell 300-H after removing the outer casing to ease problems of access into
the mechanical room.
*5 Only for 92 and 119 USG (350 and 450 L) saturated steam 15 psig at 250°F (121°C)

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
42 and 53 USG (160 and 200 L)
Technical Data
Legend
AQ Aquastat Well
BWR Boiler Water Return
BWS Boiler Water Supply
DCW Domestic Cold Water
DHW Domestic Hot Water
IO Inspection and Clean-out Opening
TPV Temperature and Pressure Relief Valve
RT Recirculation tapping
92 and 119 USG (350 and 450L)
Legend
AQ Aquastat Well
BWR Boiler Water Return
BWS Boiler Water Supply
DCW Domestic Cold Water
DHW Domestic Hot Water
IO Inspection and Clean-out Opening
TPV Temperature and Pressure Relief Valve
Dimensions
Storage capacity USG (L) 42 (160) 53 (200)
a in. (mm) 34 (866) 40b(1030)
Dimensions
Storage capacity USG (L) 92 (350) 119 (450)
a in. (mm) 55 (1397) 57b(1461)
b in. (mm) 2a(57) 2c(72)
c in. (mm) 5b(139) 5b(138)
d in. (mm) 6c(170) 8 (203)
e in. (mm) 5a(133) 5a(137)
f in. (mm) 3 (78) 3 (78)
g in. (mm) 14b(368) 16 (409)
h in. (mm) 23 (586) 25 (636)
k in. (mm) 7b(193) 9 (226)
l in. (mm) 23b(594) 26c(677)

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Technical Data
Pressure Drop
Heat-up time
The stated heating times are achieved when the
maximum recovery rate of the domestic hot water tank
is made available at the respective supply temperature
and with a domestic hot water rise from 50 to 140°F
(10 to 60°C).
Domestic hot water draw rate
Pressure drop on domestic hot water side (secondary circuit)
Pressure drop on heating water side (primary circuit)
Storage Capacity USG
(L)
42
(160)
53
(200)
92
(350)
119
(450)
Heating water supply
temperature
194°F (90°C)
176°F (80°C)
158°F (70°C)
Heat-up time (minutes)
19
26
34
18
25
32
15
20
31
20
26
40
Storage Capacity USG
(L)
42
(160)
53
(200)
92
(350)
119
(450)
Domestic hot
water draw rate
GPM
(L/min)
2.6
(10)
2.6
(10)
4.0
(15)
4.0
(15)
Domestic hot
water draw
Water with
t=140°F (60°C)
(constant)
USG
(L)
40
(150)
49
(185)
83
(315)
116
(440)
Percentage Tank
Volume
94% 93% 90% 97%
Storage tank contents heated to 140°F (60°C), boiler not
reheating
Legend
A42 USG (160 L) storage capacity
B53 USG (200 L) storage capacity
C92 USG (350 L) storage capacity
D119 USG (450 L) storage capacity
Legend
A42 and 53 USG (160 and 200 L) storage capacity
B92 and 119 USG (350 and 450 L) storage capacity

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Multiple Tank Installation
Product Installation
Total capacity of tank battery USG (L) 184 (700) 238 (900) 357 (1350)
Number of storage tanks 2 2 3
Storage capacity per tank USG (L) 92 (350) 119 (450) 119 (450)
Layout Max. number of tanks which may be stacked on top of each other.
Recovery rates*1
with a temperature rise
of the domestic hot water
from 50 to 140°F (10 to 60°C)
and heating water supply
temperature of . . . . . . at the
supply flow rate stated below
194°F MBH (kW)
(90°C) GPH (L/h)
478 (140)
636 (2408)
560 (164)
744 (2820)
839 (246)
1116 (4230)
176°F MBH (kW)
(80°C) GPH (L/h)
348 (102)
462 (1754)
423 (124)
564 (2132)
635 (186)
864 (3198)
158°F MBH (kW)
(70°C) GPH (L/h)
232 (68)
312 (1170)
266 (78)
354 (1342)
399 (117)
534 (2013)
Supply flow rate
for the recovery rates stated GPM (m3/h) 44 (10) 44 (10) 66 (15)
Recovery rates
with a temperature rise of the
domestic hot water from
50 to 113°F (10 to 45°C)
a steam pressure of . . . .
and a max. steam velocity of
164 ft/s (50 m/s)
7bpsig MBH(kW)
GPH (L/h)
566 (166)
1080 (4078)
566 (166)
1080 (4078)
850 (249)
1620 (6117)
15 psig MBH (kW)
GPH (L/h)
717 (210)
1362 (5160)
717 (210)
1362 (5160)
1075 (315)
2046 (7740)
Standby losses*2 MBH/24 h 12.0 13.2 19.8
WARNING
In a multiple tank installation, it is recommended that an
additional high limit aquastat be installed in the common
domestic hot water supply header to the system.
This aquastat should be wired in series to the operating
aquastat on the tank battery. The setting on this
additional high limit aquastat should be approximately
9°F (5°C) higher than the operating high limit.
Ensure that temperature tempering valve(s) is/
are installed if the domestic hot water storage tank
temperature exceeds 140°F (60°C) to protect from
scalding.
Consult plumbing codes and authorities for local
requirements.
Installation of additional aquastat(s)
*1 When planning for the recovery rate as stated or calculated, allow for the corresponding circulation pump.
The stated recovery rate is only achieved when the rated output of the boiler is equal to or greater than that
stated under “Recovery rates”.
*2 Measured values are based on a room temperature of 68 ºF (20 ºC) and a domestic hot water temperature of
149 ºF (65 ºC) and can vary by ±5%.
Three possible combinations are shown below as examples.
Note the maximum number of tank units which may be stacked upon one another.

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Product Installation
Multiple Tank Installation (continued)
Storage Capacity USG
(L)
92
(350)
119
(450)
119
(450)
Battery storage
capacity
USG
(L)
184
(700)
240
(900)
360
(1350)
Number of tanks 223
Heating water supply
temperature
194°F (90°C)
USG /10 min
(L) /10 min
176°F (80°C)
USG /10 min
(L) /10 min
158°F (70°C)
USG /10 min
(L) /10 min
Quick recovery
(over 10-minute period)
219
(830)
219
(830)
203
(769)
317
(1200)
300
(1137)
277
(1050)
433
(1640)
408
(1545)
378
(1430)
Storage Capacity USG
(L)
92
(350)
119
(450)
119
(450)
Battery storage
capacity
USG
(L)
184
(700)
240
(900)
360
(1350)
Number of tanks 223
Domestic hot
water draw rate
GPM
(L/min)
7.9
(30)
7.9
(30)
7.9
(30)
Domestic hot
water draw
Water with
t=140°F (60°C)
(constant)
USG
(L)
166
(630)
232
(880)
349
(1320)
Percentage Tank
Volume
90% 97% 97%
Standard equipment
Vitocell 300-H, with 42 to 119 USG (160 to 450 L) capacity
Domestic hot water tank of high-alloy stainless steel with
PUR Foam insulation with:
– adjustable leveling feet.
The following is packed separately and attached to the crate:
– installation fittings package
– temperature and pressure relief valve
– sensor well with insulation
– thermometer
– Installation Instructions, Start-up/Service Instructions
and Operating Instructions.
Electrostatically powder coated sheet metal enclosure
panel in a Vitosilver finish.
Domestic hot water draw rate
Storage tank content heated to 140°F (60°C),
boiler not reheating
Quick recovery (over 10-minute period)
Domestic hot water rise from 50 to 113°F (10 to 45°C)
Max. domestic hot water draw rate (over 10-minute period)
Domestic hot water rise from 50 to 113°F (10 to 45°C)
Storage Capacity USG
(L)
92
(350)
119
(450)
119
(450)
Battery storage
capacity
USG
(L)
184
(700)
240
(900)
360
(1350)
Number of tanks 223
Heating water supply
temperature
194°F (90°C)
USG /10 min
(L) /10 min
176°F (80°C)
USG /10 min
(L) /10 min
158°F (70°C)
USG /10 min
(L) /10 min
Quick recovery
(over 10-minute period)
21.9
(83)
21.9
(83)
20.3
(77)
31.7
(120)
30.1
(114)
27.7
(105)
43.3
(164)
40.7
(154)
37.8
(143)

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data Product Installation
Connections
IMPORTANT
When connecting an externally powered anode to the top
flange lid, separate the magnesium anode in the bottom
flange lid from the grounding cable. The magnesium anode
may remain installed.
IMPORTANT
When connecting an externally powered anode to the top
flange lid, separate the magnesium anode in the bottom
flange lid from the grounding cable. The magnesium anode
may remain installed.
Legend
ADomestic hot water supply
B DHW recirculation line
C DHW recirculation pump
D Spring loaded flow check valve
E Discharge pipe of temperature and pressure relief valve
F Temperature and pressure relief valve
G Shut-off valve
H Drain
K Domestic cold water supply lines
L Backflow preventer
M Domestic cold water inlet
N Precharged expansion tank
(required where backflow preventer is installed;
check local plumbing codes and requirements)
O Thermostatic mixing valve/anti-scald
Domestic hot water connections
42 and 53 USG (160 and 200 L) capacity
Domestic hot water connections
92 and 119 USG (350 and 450 L) capacity

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Product Installation
Sensor Well
Vitocell 300-H, 42 and 53 USG (160 and 200 L)
The sensor well is welded into the DHW tank.
Heating water supply temperatures over 230°F (110°C)
For these operating conditions, an approved high limit
safety aquastat must be installed to limit the domestic hot
water temperature to 203°F (95°C) in the tank.
Recirculation tapping
The recirculation tapping on the Vitocell-H 300 is also the
opening for mounting the temperature and pressure relief
valve.
If this opening is utilized for recirculation, extend the
stainless steel nipple on the tank with a brass tee of the
same size as the stainless steel nipple 7to accommodate
both connections; see installation the instructions.
Vitocell 300-H, 92 and 119 USG (350 and 450 L)
Temperature and pressure relief valve
A temperature and pressure relief valve (T&P relief valve)
is supplied with the tank. The heating contractor must
install the valve on each tank in a method meeting code
requirements. If local codes require a different relief valve,
substitute the manufacturer’s supplied valve. The tank is
approved for 100 psig where a CRN is required. Maximum
operating pressure is 150 psig.
For steam applications, a field supplied 1” T&P valve must
be utilized.
T&P Valve set pressure 150 psig
ASME pressure steam rating see ratings marked on
the T&P valve
CSA discharge capacity 205 MBH
Relief temperature 210°F (99°C)
Inlet thread c” male
Outlet thread c” female
Warranty excerpt
Our warranty for domestic hot water tanks states that the
water heated should be of drinking water quality and that
any water treatment equipment in use must function
correctly.
If the product has been improperly installed or misapplied
by the installer, contractor or final user, Viessmann
accepts no responsibility for damage howsoever caused
and reserves the right to withdraw the product warranty.
In order to qualify for product warranty, strict adherence
to the installation and service manuals must be observed.
In the event that Viessmann non-approved components
are utilized, Viessmann reserves the right to withdraw all
expressed or implied warranties without written notice.
The water to be heated with the Vitocell must be drinking
(potable) water quality. If the tank is used to heat other
media, the warranty will be null and void. Damage
resulting from excessive pressure or temperature is clearly
not the responsibility of Viessmann.
The amount of chloride and sulfate acceptable to the tank
is limited. In areas where high concentrations of chloride
and sulfate are present in drinking water, please consult
Viessmann for directions.
For full warranty details, please read the product warranty
card.
Backflow preventers
Where backflow preventers are required, a domestic
water expansion tank installation is recommended in the
cold water inlet piping before the cold water enters the
Vitocell. For the backflow device, observe local plumbing
codes and regulations.
WARNING
To ensure optimum, safe operation, the supplied
stainless steel well must be installed. The well diameter
is large enough to accommodate a wide variety of
sensing bulbs. Always use spring clip to ensure proper
contact of capillary bulb against the stainless steel well
for proper sensing/heat transfer!

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Continuous Flow Capacity Chart
Sizing
42 USG (160 L) capacity
Curve ADomestic hot water 40 to 140°F (4 to 60°C)
Curve BDomestic hot water 40 to 176°F (4 to 80°C)

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Technical Data
Continuous Flow Capacity Chart (continued)
53 USG (200 L) capacity
Curve ADomestic hot water 40 to 140°F (4 to 60°C)
Curve BDomestic hot water 40 to 176°F (4 to 80°C)

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Continuous Flow Capacity Chart (continued)
Technical Data
92 USG (350 L) capacity
Curve ADomestic hot water 40 to 140°F (4 to 60°C)
Curve BDomestic hot water 40 to 176°F (4 to 80°C)

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data
Continuous Flow Capacity Chart (continued)
Technical Data
119 USG (450 L) capacity
Curve ADomestic hot water 40 to 140°F (4 to 60°C)
Curve BDomestic hot water 40 to 176°F (4 to 80°C)

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5696 674 - 03
Vitocell 300-H, EHA Series Technical Data Technical Data
Continuous Flow Capacity Chart (continued)
Example: Vitocell 300-H, 119 USG (450 L) capacity
Assume boiler output to tank is 238 MBH. Enter chart
at left and draw horizontal line across to recovery rate
of 284 GPH or 4.7 GPM for 140°F (60°C) domestic
hot water under column A. Where the horizontal line
intersects the 194°F (90°C) curve is the point of
intersection for the diagonal line used to size the pump.
The diagonal line begins at the origin and goes through
the point of intersection extending up to the top of the
chart. Read between the reference diagonal lines to get
a pump specification of 15 GPM at 4.5 ft.
To summarize:
For a Vitocell-H 300 with 119 USG (450 L) capacity
and 238 MBH input, the boiler water temperature is
194°F (90°C), difference between boiler return and
supply water temperature is 31°F (17°C), recovery
rate is 4.7 GPM of 140°F (60°C) DHW, and the pump
required is 15 GPM, 4.5 ft. plus pressure drop in piping
and boiler. If a multiple tank application is required,
i.e. 4 tanks at 238 MBH input each, then the pump
selection would be (4 x 15 GPM) 60 GPM at 4.5 ft.
plus piping pressure drop.

5696 674 - 03 Technical information subject to change without notice. Printed on environmentally friendly
(recycled and recyclable) paper.
Vitocell 300-H, EHA Series Technical Data
Steam Chart
Continuous flow of domestic hot water at a temperature
of 140°F (60°C) at 100°F (56°C) rise with a steam
velocity of 164 ft./sec (50 m/sec) using saturated steam.
Technical Data