Heat-Flo 115-ST-C Service manual

HEAT-FLO HOT WATER STORAGE/ BOOSTER TANKS
MODELS 30-ST, 40-ST, 40L-ST, 60-ST, 60L-ST
80-ST, 115-ST, 80-ST-C, 115-ST-C
Heat-Flo, Inc.
15 Megan Ct., P.O. Box 612 Uxbridge, MA 01569 USA
Bulletin I0-ST-010115
For service or repairs to the water heater, call your heang contractor. Your water heater has been manufactured
to provide years of service. In order to insure proper service, the following informaon is provided to assist
in enabling the installaon, operaon, and maintenance of this water heater. For your comfort, safety, and
convenience, we recommend that this water heater be installed and serviced by a plumbing professional. When
the installaon is completed, keep this manual with the water heater. Informaon and specicaons outlined
in this manual in eect at the me of prinng of this manual. Heat-Flo reserves the right to disconnue, change
specicaons, or change system design at any me without noce.
Conforms to UL STD 174 and NSF/ANSI 372
Cered to CAN/CSA STD C22.2 No. 110-94
INSTALLATION, OPERATING, AND
SERVICE INSTRUCTIONS

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"#$%&'!()$*+,#&-*)!
The$following$terms$and$symbols$are$used$to$bring$attention$to$the$presence$of$$
various$risk$levels,$or$to$important$information$concerning$product$life.$
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Indicates$ presence$ of$ a$ hazard,$ which$ will$ cause$ severe$ personal$ injury,$
death,$or$substantial$property$damage$if$ignored.$
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Indicates$the$presence$of$a$ hazard,$which$ can$ cause$severe$personal$injury,$
death,$or$substantial$property$damage$if$ignored.$
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Indicates$the$presence$of$a$hazard,$which$can$cause$minor$personal$injury$or$
damage$if$ignored.$
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Indicates$ special$ instructions$ on$ installation,$ operation,$ or$ maintenance,$
which$are$important$but$not$related$to$personal$injury$hazards.$
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Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$1$
(./012342!(4501.32(04!6!1738!93175:;;<!
NOTE:$ The$ equipment$ shall$ be$ installed$ in$ accordance$ with$ those$ installation$ regulations$ required$ in$ the$ area$
where$the$installation$is$to$be$made.$These$regulations$shall$be$carefully$followed$in$all$cases.$Authorities$having$
jurisdiction$shall$be$consulted$before$the$installations$are$made.$
$
All$wiring$on$water$heaters$must$be$in$accordance$with$the$National$Electrical$Code$(latest$edition)$and/or$local$
regulations$in$the$US,$and$in$accordance$with$the$Canadian$Electrical$Code$(latest$edition)$and/or$local$regulations$
in$Canada.$
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Improper$installation,$adjustment,$alteration,$service$or$maintenance$can$cause$property$damage,$personal$injury,$
or$ loss$ of$ life.$ Read$ and$ understand$ the$ entire$ manual$ before$ attempting$ installation,$ start?up,$ operation,$ or$
service.$Installation$and$service$must$be$performed$only$by$an$experienced,$skilled$installer$or$service$agency.$
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This$ water$ heater$ contains$ very$ hot$ water$ under$ high$ pressure.$ Do$ not$ unscrew$ any$ pipe$ fittings$ or$ attempt$ to$
disconnect$ any$ components$ of$ this$ water$ heater$ without$ positively$ assuring$ that$ the$ water$ is$ cool$ and$ has$ no$
pressure.$Always$wear$protective$clothing$and$equipment$when$installing,$starting$up$or$servicing$this$water$heater$
to$prevent$scalding$injuries.$Do$not$rely$on$the$pressure$and$temperature$gauges$to$determine$the$temperature$
and$pressure$of$the$water$heater.$This$water$heater$contains$components$that$become$very$hot$when$the$boiler$is$
operating.$Do$not$touch$any$components$unless$they$are$cool.$
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Failure$ to$ follow$ all$ instructions$ in$ the$ proper$ order$ can$ cause$ personal$ injury$ or$ death.$ Read$ all$ instructions,$
including$ all$ those$ contained$ in$ component$ manufacturers’$ manuals$ before$ installing,$ starting$ up,$ operating,$
maintaining,$or$servicing$the$water$heater.$
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To$reduce$the$risk$of$excessive$pressures$and$temperatures$in$this$water$heater,$install$temperature$and$pressure$
protective$equipment$required$by$local$codes$but$no$less$than$a$combination$temperature$relief$valve$certified$by$
a$nationally$recognized$testing$laboratory$that$maintains$periodic$inspection$of$production$of$listed$equipment$or$
materials,$ as$ meeting$ the$ requirements$ for$ Relief$ Valves$ and$ Automatic$ Shutoff$ Devices$ for$ Hot$ Water$ Supply$
Systems,$ANSI$Z21.22?latest$edition.$ This$valve$must$be$marked$with$ a$maximum$set$pressure$not$to$exceed$the$
marked$ working$ pressure$ of$ the$ water$ heater.$ Install$ the$ valve$ into$ an$ opening$ provide$ 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$at$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.$
Improper$water$quality$will$reduce$the$life$of$the$water$heater.$Hard$water,$sediment,$high$or$low$PH$and$high$
levels$ of$ chlorides$ in$ the$ domestic$ water$ should$ be$ avoided.$ Be$ sure$ that$ PH$ levels$ fall$ between$ 6$ and$ 8$ and$
dissolved$chlorides$are$less$than$100$ppm.$A$filter$must$be$used$where$sediment$is$greater$than$5$microns$in$size$in$
the$ water$ supplied$ to$ the$ unit.$ A$ water$ softening$ system$ is$ recommended$ for$ areas$ with$ hard$ water.$ In$ cases$
where$water$quality$is$unknown,$a$qualified$water$treatment$expert$should$be$consulted.$$
NOTICE:$Damage$to$tanks$caused$by$improper$water$quality$is$not$covered$under$the$warranty.$
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DO$NOT$store$or$use$gasoline$or$other$flammable$vapors$or$liquids$in$the$vicinity$of$this$or$any$other$appliance.$$If$
you$smell$gas$vapors,$DO$NOT$try$to$operate$any$appliance$?$DO$NOT$touch$any$electrical$switch$or$use$any$phone$
in$ the$ building.$ Immediately,$ call$ the$ gas$ supplier$ from$ a$ remotely$located$ phone.$ Follow$ the$ gas$ supplier’s$
instructions$or$if$the$supplier$is$unavailable,$contact$the$fire$department.$Do$not$operate$any$appliance$until$the$
leakage$is$corrected.$
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This$ water$ heater$ is$ supplied$ with$ an$ adjustable$ thermostat$ to$ control$ the$ water$ temperature.$ Hot$ water$
temperatures$ required$ for$ automatic$ dishwashers$ and$ laundry$ use$ can$ cause$ scald$ burns$ resulting$ in$ serious$
personal$injury$and/or$death.$The$temperature$at$which$injury$occurs$varies$with$the$person’s$age$and$the$time$of$
exposure.$The$slower$response$time$of$disabled$persons$increases$the$hazard$to$them.$47=71$allow$small$children$
to$use$a$hot$water$tap$or$to$draw$their$own$bath$water.$47=71$leave$a$child$or$disabled$person$unattended$in$a$
bathtub$or$a$shower.$

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$2$
(./012342!"3572<!(4"21:92(04"!
READ$ALL$INSTRUCTIONS$BEFORE$USING$THIS$WATER$HEATER.$
WARNING$–$When$using$electrical$appliances,$safety$precautions$should$be$taken$to$reduce$the$
risks$of$fire,$electric$shock,$and$injury.$$These$precautions$include$the$following:$
•This$water$heater$must$be$grounded.$Connect$only$to$a$properly$grounded$outlet.$See$
“GROUNDING$INSTRUCTIONS”$found$in$Section$IV.$
•Install$ or$ locate$ this$ water$ heater$ only$ in$ accordance$ with$ the$ provided$ installation$
instructions.$
•Use$this$water$heater$only$for$its$intended$use$as$described$in$this$manual.$
•Do$not$use$an$extension$cord$set$with$this$water$heater.$If$no$outlet$is$available$adjacent$
to$the$water$heater,$contact$a$qualified$electrician$to$have$one$properly$installed.$
•As$with$any$appliance,$close$supervision$is$necessary$when$used$by$children.$
•Do$not$operate$this$ water$ heater$if$it$has$a$ damaged$ cord$or$plug,$if$it$ is$ not$working$
properly,$or$if$it$has$been$damaged$or$dropped.$
•Your$water$heater$should$be$installed$and$serviced$only$by$qualified$personnel.$Contact$
nearest$authorized$service$facility$for$examination,$repair,$or$adjustment.$
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"3=7!2>7"7!(4"21:92(04"!
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Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$3$
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Hot Water Storage/ Booster Tanks





Fully insulated stainless steel tanks, including L4080B aquastat. Brass drain and T&P valves are factory installed.
Dip tubes in tank located to circulate water through the heat source and return to the tank.
Fully insulated stainless steel tanks, including L4080B aquastat. Brass drain and T&P valves are factory installed.
Dip tubes in tank located to circulate water through the heat source and return to the tank.
!
!
! !

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$4$
/+%?-)@&#AA#&-*)!9*)@-B%+#&-*)@!
Inspect$shipment$carefully$for$signs$of$damage.$All$equipment$is$carefully$inspected$and$packed.$
Heat?Flo’s$ responsibility$ ceases$ upon$ delivery$ of$ the$ water$ heater$ to$ the$ carrier$ in$ good$
condition.$Any$claims$for$damage$or$shortage$must$be$filed$immediately$against$the$carrier$by$
the$consignee.$No$claims$for$variances$or$shortages$will$be$allowed$by$the$Manufacturer,$unless$
they$are$presented$within$sixty$days$after$receipt$of$the$equipment.$
Installation$ must$ conform$ to$ the$ requirements$ of$ the$ authority$ having$ jurisdiction.$ In$ the$
absence$ of$ such$ requirements,$ installation$ must$ conform$ to$ the$ National$ Plumbing$ Code$ and$
the$National$Electrical$Code$ANSI/NFPA$No.$70$(current$edition).$
(./012342!904"(87132(04"!C75017!(4"23;;32(04!
1. Tank$sizing:$
Choose$the$water$heater$model$based$on$the$expected$water$usage$for$the$given$site.$$
Factors$that$ increase$water$ demand$ dramatically$ include$ high$ flow$ shower$ heads,$ hot$
tubs,$ and$ the$ use$ of$ more$ than$ one$ shower$ at$ a$ time.$ Increase$ the$ tank$ size$ if$ these$
factors$are$present.$9*)@DA&!3">137!@-E-)F!FD-B%@!#)B!*&G%+!+%$%+%)H%@I
;0932(4J!2>7!K3271!>73271$
The$ water$ heater$ should$ be$ located$ in$ an$ area$ where$ water$ leakage$ from$ the$ tank$ or$
connections$will$not$result$in$damage$to$areas$adjacent$to$the$water$heater$or$to$lower$floors$of$
the$structure.$When$such$a$location$cannot$be$avoided,$a$suitable$drain$pan$must$be$installed$
under$the$water$heater,$and$the$drain$pan$must$be$connected$to$a$drain.$The$drain$pan$depth$
must$ be$ suitable$ for$ draining$ and$ collecting$ water.$ The$ piping$ to$ drain$ must$ be$ at$ least$ 3/4”$
diameter$and$be$pitched$for$proper$drainage.$
The$ water$ heater$ should$ be$ installed$ as$ close$ to$ the$ boiler$ as$ is$ practical$ for$ easy$ access$ for$
service.$The$unit$is$designed$for$installation$on$combustible$flooring$and$in$alcoves,$closets,$etc.$
2G%!,-)-,D,!HA%#+#)H%@!$+*,!H*,LD@&-LA%!@D+$#H%@!#+%M!
!Bottom$ 0”$
$ Left,$Right,$and$Rear$Sides$ 1”$
$Front$1”$
$Top$6”$
2G%!,-)-,D,!HA%#+#)H%@!$*+!@%+N-H%!#+%M!
!Bottom$ 0”$
$ Left,$Right,$and$Rear$Sides$ 3”$
$Front$30”$
$Top$6”$

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$5$
388(2(043;!1790..74878!90./04742"!
1. "GD&?0$$! =#AN%@M$ Allows$ the$ isolation$ of$ the$ water$ heater$ from$ the$ boiler$ system$
during$service.$
2. :)-*)@M$Allows$for$easy$locating$or$removal.$
3. =#HDD,!C+%#O%+M$Protects$the$water$heater$from$collapse$if$a$hot$tank$is$valved$off$to$
service$other$components$in$the$system.$
PI 2G%+,#A! %QR#)@-*)! &#)OI! ($! &G%! S#&%+! G%#&%+! -@! -)@&#AA%B! -)! #! HA*@%B! S#&%+! @DRRA'!
@'@&%,T!@DHG!#@!#!@'@&%,!G#N-)F!#!L#HO!$A*S!R+%N%)&%+T!#!HG%HO!N#AN%T!*+!#!R+%@@D+%!
+%BDH-)F!N#AN%!-)!&G%!H*AB!S#&%+!@DRRA'!A-)%T!&G%!-)@&#AA#&-*)!*$!#!&G%+,#A!%QR#)@-*)!
&#)O!-@!+%UD-+%BI!
!
!
For$ California$ installation$ this$ water$ heater$ must$ be$ braced,$ anchored,$ or$ strapped$ to$
avoid$ falling$ or$ moving$ during$ an$ earthquake.$ See$ instructions$ for$ correct$ installation$
procedures.$Instructions$may$be$obtained$from$California$Office$of$the$State$Architect.$
!
K#&%+!VD#A-&'!
Improper$water$quality$will$reduce$the$expected$life$of$the$water$heater.$Hard$water,$sediment,$
high$or$low$Ph,$and$high$levels$of$chlorides$in$the$domestic$water$should$be$avoided.$Sediment$
and$hard$water$will$eventually$coat$the$heating$coil$inside$the$water$heater$and$reduce$the$rate$
of$hot$water$production$and$may$eventually$cause$a$failure.$High$or$low$Ph$and/or$high$chloride$
concentrations$ will$ cause$ corrosion$ and$ eventually$ failure.$ A$ filter$ is$ strongly$ recommended$
where$sediment$is$present$in$the$water.$ A$ water$ softening$system$is$recommended$for$areas$
with$hard$water.$In$an$area$where$the$water$quality$is$not$known,$a$water$quality$test$should$
be$performed.$
K314(4JM!
Do$ not$ operate$ the$ Heat?Flo$ water$ heaters$ in$ areas$ where$ the$ Ph$ is$ above$ 8.0$ or$ below$ 6.0,$
and/or$ with$ chloride$ concentrations$ greater$ than$ 100$ parts$ per$ million$ (ppm).$ Heat?Flo’s$
standard$warranty$does$not$cover$problems$caused$by$improper$water$Ph$or$excessive$levels$of$
chlorides.$
$
$
$
Damage&to&tanks&caused&by&improper&water&quality&is&not&covered&under&the&warranty.&
/(/(4J!
80.7"2(9!K3271!/(/(4J!W"%%!5-FD+%!XT!/FI!YZ!
1. Drain$the$domestic$water$system.$ $
•Shut$off$the$cold$water$supply$at$the$main$shutoff$valve.$
•Open$one$or$more$faucets$to$relieve$the$pressure.$
•Open$the$system$drain,$leaving$the$faucets$open.$

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$6$
2. Position$the$water$heater$in$its$final$location$
3. Connect$the$cold$water$supply$piping.$
•Install$piping$onto$cold$inlet$connection.$
•Connect$to$cold$water$supply$connection$using$a$union,$a$heat$trap,$a$shut?off$valve,$a$
vacuum$breaker,$an$expansion$$tank$(where$required),$and$a$filter$(recommended$to$
prevent$sediment$buildup).$
$
!
If$ installing$ on$ a$ city$ supply,$ a$ properly$ sized$ thermal$ expansion$ tank$ is$ required$ and$
should$be$installed$in$accordance$with$the$product$installation$manual.$
If$ a$ water$ heater$ is$ installed$ in$ a$ closed$ water$ supply$ system,$ such$ as$ one$ having$ a$
backflow$preventer$in$the$cold$water$supply,$a$check$valve$in$the$cold$water$supply,$or$a$
pressure$ reducing$ valve$ in$ the$ cold$ water$ supply$ means$ shall$ be$ provided$ to$ control$
thermal$expansion.$
The$appliance,$when$installed,$must$be$grounded$in$accordance$with$the$local$codes,$or$
in$the$absence$of$local$codes,$with$the$National$Electrical$Code,$ANSI/NFPA$70.$
$
$
If$this$product$is$connected$to$a$cold$water$supply$line$that$has$a$check$valve,$a$backflow$
preventer,$ a$ pressure$ reducing$ valve,$ or$ a$ check$ valve$ in$ the$ water$ meter,$ it$ is$ a$
requirement$that$a$properly$sized$thermal$expansion$tank$be$installed$in$the$cold$water$
inlet$line.$$There&will&be&no&warranty&on&applications&where&there&is&no&pressure&control.&
4. Connect$the$domestic$hot$water$piping.$
•Install$piping$onto$hot$water$supply$connection$using$a$union,$a$heat$trap,$and$a$shut$
off$valve.$$$
•Pipe$the$relief$valve$discharge$so$that$the$discharge$from$the$valve$will$exit$only$within$
6$ inches$ above,$ or$ at$ any$ distance$ below,$ the$ structural$ floor$ and$ so$ that$ it$ cannot$
contact$ any$ live$ electrical$ part.$ $ The$ discharge$ opening$ must$ not$ be$ blocked$ or$
reduced$in$size$under$any$circumstances.$$
!
Install$ a$ discharge$ line$ so$ that$ water$ discharged$ from$ the$ temperature$ and$ pressure$
relief$ valve$ will$ exit$ within$ six$ (6)$ inches$ above,$ or$ any$ distance$ below,$ the$ structural$
floor$and$cannot$contact$any$live$electrical$part.$The$discharge$line$is$to$be$installed$to$
allow$for$complete$drainage$of$both$the$temperature$and$pressure$relief$valve$and$the$
discharge$line.$The$discharge$opening$must$not$be$subjected$to$blockage$or$freezing.$
80! 402! thread,$ plug,$ or$ cap$ the$ discharge$ line.$ It$ is$ recommended$ that$ a$ minimum$
clearance$of$four$(4)$inches$be$provided$on$the$side$of$the$water$heater$for$servicing$and$
maintenance$of$the$combination$temperature$and$pressure$relief$valve.$
8*!)*&!RA#H%!#!N#AN%!L%&S%%)!&G%!H*,L-)#&-*)!&%,R%+#&D+%!#)B!R+%@@D+%!+%A-%$!N#AN%!
#)B!&G%!&#)O[$
$

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$7$
5. Fill$the$water$heater.$
•Open$all$faucets$ to$allow$air$ to$ purge$from$ the$ tank$and$piping.$ Remove$ screens$on$
faucets.$
•Open$domestic$hot$water$shut?off$valve.$
•Open$cold$water$inlet$shut?off$valve.$$
•Purge$all$of$the$air$from$the$domestic$water$system.$Allow$water$to$run$so$the$tank$is$
completely$purged$of$ any$debris.$Run$ the$ water$long$ enough$ to$change$at$ least$ five$
tank$volume$changes.$$
•Close$all$faucets.$Reinstall$all$of$the$screens$in$the$faucets.$
•Check$the$system$for$leaks.$Repair$as$required.$
0/7132(04!
"2312:/!
After$the$water$heater$has$been$ plumbed$ and$wired$and$the$boiler$water$piping$is$purged$of$
air,$the$water$heater$is$ready$to$be$started.$$
1. The$tank$thermostat$is$factory$pre?set$to$125$degrees$F$and$will$call$for$heat$if$the$water$in$
the$tank$is$lower$than$that$(125$deg.$F).$$
2. On$a$call$for$heat,$the$tank$thermostat$contacts$close$to$start$the$circulator.$$
3. After$ the$ tank$ has$ reached$ the$ temperature$ setting,$ the$ tank$ thermostat$ opens$ and$ de?
energizes$the$circulator.$$
!!!!!!!!!!!!!!!!!!!!!!!!!!!?!"93;8(4J[!
This$water$heater$can$deliver$scalding$temperature$water$at$any$faucet$in$the$system.$$
Be$careful$when$using$hot$water$to$avoid$scalding$injury.$$By$setting$the$thermostat$on$
this$ water$ heater$ to$ obtain$ an$ increased$ water$ temperature,$ you$ create$ the$ potential$
for$scald$injury.$$To$protect$against$injury,$you$should$install$ an$ ASSE$ approved$ mixing$
valve$ (a$ device$ to$ limit$ the$ temperature$ of$ water$ to$ protect$ against$ scald$ injury$ via$
mixing$hot$and$cold$water$supply)$in$the$water$system.$$This$valve$will$reduce$point$of$
discharge$ temperature$ in$ branch$ supply$ lines.$ $ Such$ valves$ are$ available$ from$ a$ local$
plumbing$supplier.$$Please$consult$with$a$plumbing$professional.$$$
"93;8!17;32(04">(/"!
The$tank$thermostat$controls$the$maximum$water$temperature$in$the$water$heater.$If$it$is$set$
too$ high,$ the$ resulting$ hot$ water$ can$ cause$ painful$ scalding$ with$ possible$ serious$ and$
permanent$ injury.$ The$ temperature$ at$ which$ this$ occurs$ varies$ with$ a$ person’s$ age,$ and$ the$
length$ of$ time$ in$ contact$ with$ the$ hot$ water.$ The$ slower$ response$ time$ of$ infants,$ older,$ or$
handicapped$people$increase$the$hazard$for$them.$
$ $

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$8$
K3271!27./7132:17!38\:"2.742!
It$is$recommended$that$the$thermostat$be$set$for$the$lowest$possible$temperature$that$satisfies$
your$needs.$This$will$also$provide$you$with$the$lowest$energy$consumption$and$cost.$
Check$ the$ water$ temperature$ at$ a$ hot$ water$ faucet$ soon$ after$ the$ tank$ thermostat$ has$
satisfied,$and$the$circulator$and$the$boiler$have$turned$off.$Adjust$as$needed.$
Lowering$the$thermostat$setting$will$not$have$an$immediate$effect$on$the$water$temperature$
because$the$stored$water$will$have$to$be$used$and$the$thermostat$must$go$through$the$cycle$of$
heating$ cold$ water$ and$ satisfying$ at$ the$ new,$ lower$ temperature.$ Additional$ temperature$
checks$should$follow$the$completion$of$a$heating$cycle.$Further$adjustments$may$be$required$
after$you$have$used$the$water$heater.$
$
$
The$ table$ below$ details$ the$ approximate$
relationship$ of$ water$ temperature$ and$ time$
with$regard$to$scald$injury$and$may$be$used$as$
a$ guide$ in$ determining$ the$ safest$ water$
temperature$for$your$applications.$
$
!
$
The$ scald$ label$ shown$ to$ the$ right$can$ be$
found$ on$ all$ Heat;Flo$ Indirect$ Water$ Heaters$
and$Storage$tanks.$$Take$note$and$use$caution$
when$adjusting$the$temperature$settings$with$
your$water$system.$$Be$sure$to$always$feel$the$
water$before$ bathing$or$showering,$especially$
when$drawing$a$bath$for$an$infant$or$elder.$$$
$
–$(,R*+&#)&!K314(4J!-)$*+,#&-*)!*)!&G%!$*AA*S-)F!R#F%I$–$

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$9$
!
It$ is$ the$ responsibility$ of$ the$ installing$ contractor$ to$ see$ that$ all$ controls$ are$ correctly$
installed$and$are$operating$properly$when$the$installation$is$complete.$$$
80!402$operate$the$water$heater$with$jumpered$or$absent$controls$or$safety$devices.$$$
80!402$tamper$with$or$alter$the$water$heater$and/$or$controls.$
80! 402$ operate$ the$ water$ heater$ if$ any$ external$ part$ has$ been$ under$ water.$$
Immediately$call$ a$qualified$ service$ technician$ to$ inspect$the$ appliance$and$ to$replace$
any$part$of$the$control$system$that$is$or$had$been$under$water.$$$
80! 402$ install$ this$ water$ heater$ on$ carpeting.$ $ This$ water$ heater$ is$ suitable$ for$
installation$on$combustible$flooring.$
80!402$operate$this$water$heater$without$first$being$certain$it$is$filled$with$water.$
.3(42743497!
The$water$heater$ is$intended$to$ provide$ many$years$ of$ reliable$service.$Components,$ such$ as$
thermostats$and$relief$valves,$may$be$subject$to$failures$that$require$service.$Depending$on$the$
quality$of$ the$ water$ supply,$ sediment$ and/or$ scale$may$ coat$ the$ heating$ coil$in$ the$tank$ and$
reduce$ hot$ water$ recovery$ rate.$ Failure$ to$ use$ the$ correct$ procedures$ or$ parts$ can$ result$ in$
unsafe$operation.$
The$ owner$ should$ arrange$ to$ have$ the$ following$ inspections$ and$ simple$ maintenance$
procedures$done$at$the$suggested$frequencies.$
1. Domestic$Water$Piping$(Annual)$
•Check$ all$ piping$ for$ signs$ of$ leakage$ at$ the$ joints,$ unions$ and$ shut?off$ valves.$ Repair$ as$
required.$
2. Temperature$and$Pressure$Relief$Valve$(Annual)$
•The$ temperature$ and$ pressure$ relief$ valve$ should$ be$ checked$ to$ ensure$ that$ it$ is$ in$
operating$condition.$To$check$the$relief$valve,$lift$the$lever$at$the$end$of$the$valve$several$
times.$The$valve$should$seat$properly$and$operate$freely.$If$water$does$not$flow,$remove$
and$inspect$for$obstructions$or$corrosion.$Replace$with$a$new$valve$of$the$recommended$
capacity$as$necessary.$Do$not$attempt$to$repair$the$valve,$as$this$could$result$in$improper$
operation$and$a$tank$explosion.$In$areas$with$poor$water$conditions,$it$may$be$necessary$
to$inspect$the$temperature$and$pressure$relief$valve$more$often$than$once$a$year.$
!
Before&manually&operating&the&valve,&make&sure&that&a&drain&line&has&been&attached&to&the&valve&
to&direct&the&discharge&to&an&open&drain.&Failure&to&take&this&precaution&could&mean&contact&with&
extremely&hot&water&discharging&from&the&valve&during&this&checking&operation.&
If& the& temperature& and& pressure& relief& valve& on& the& heater& discharges& periodically& or&
continuously,&it&may&be&due&to&thermal&expansion&of&water&in&a&closed&water&supply&system,&or&it&
may&be&due&to&a&faulty&relief&valve.&Thermal&expansion&is&the&normal&response&of&water&when&it&is&
heated.&In&a&closed&system,&thermal&expansion&will&cause&the&system&pressure&to&build&until&the&
relief&valve&actuation&pressure&is&equaled.&Then&the&relief&valve&will&open,&allowing&some&water&
to& escape,& slightly& lowering& the& pressure.& Contact& your& water& supplier& or& local& plumbing&
inspector&on&how&to&control&this&situation.&

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$10$
3C0=7!3;;T!80!402!/;:J!2>7!27./7132:17!348!/17"":17!17;(75!=3;=7I!2>("!("!402!3!
"0;:2(04!348!934!917327!3!>3]3180:"!"(2:32(04I!
3. Sediment$(Annual$except$where$harsh$water$quality$may$require$more$frequent$service)$
•Depending$ on$ water$ conditions,$ a$ varying$ amount$ of$ sediment$ may$ collect$ in$ the$ tank.$
Levels$ requiring$ service$ are$ indicated$ by$ a$ small$ temperature$ difference$ between$ the$
boiler$ supply$ and$ return$ lines,$ and$ a$ reduced$ recovery$ rate.$ Repeated$ flushing$ usually$
clears$ such$ material.$ As$ a$ preventive$ measure,$ water$ should$ be$ drawn$ from$ the$ drain$
valve$until$it$runs$clear$and$the$installation$of$a$water$filter$should$be$considered.$$
4. Inspect$Anode$(annual)$
•The$ purpose$ of$ the$ magnesium$ anode$ is$ to$ reduce$ the$ damaging$ effects$ of$ aggressive$
water$ on$ the$ water$ heater.$ $ Aggressive$ water$ will$ cause$ the$ anode(s)$ to$ erode.$ $ The$
anode(s)$must$be$inspected$at$least$annually$to$determine$whether$a$new$anode$should$
be$ installed.$ $ Use$ anode$ replacement$ parts$ supplied$ by$ Heat?Flo$ only.$ $ Heat?Flo$ anodes$
are$1?1/4$NPT$and$are$made$with$magnesium,$brass,$and$stainless$steel.$$There$is$no$steel$
in$a$Heat?Flo$anode.$Severe$or$rapid$deterioration$of$the$anode$indicates$very$aggressive$
water.$ $ If$ this$ occurs,$ have$ the$ water$ tested$ to$ verify$ whether$ it$ is$ within$ the$ limits$
outlined$on$page$6.$$Failure$to$inspect$the$anode$regularly$and$replace$if$necessary$could$
result$in$damage$to$the$water$heater.$$If$this$unit$is$installed$and$maintained$according$to$
the$instructions$and$conditions$in$this$manual,$this$product$will$last$for$a$long$time.$
1.$Close$domestic$water$isolation$valves.$
2.$Drain$the$water$heater$completely$and$allow$it$to$cool$off.$
3.$Remove$the$anode$cover$on$the$front$of$the$unit.$See$figures$on$pages$2$and$3.$The$
temperature$control$can$be$turned$to$the$side$to$allow$easier$access.$
4.$After$the$water$heater$has$drained$and$cooled,$remove$the$anode$using$a$1$¾”$6?point$
socket$and$a$breaker$bar.$
5.$Inspect$the$anode$and$replace$if$needed.$The$anode$should$be$replaced$when$more$
than$6”$of$core$wire$is$exposed.$The$anode$should$be$replaced$with$a$Heat?Flo$supplied$
anode$only.$$See$above.$The$brass$hex$on$the$anode$is$1$¼$NPT$and$installs$into$a$1$¼$
stainless$half$coupling$on$the$shell$of$the$tank.$This$part$will$need$to$be$properly$Teflon$
taped$and$coated$with$a$quality$Teflon$based$pipe$sealant.$
6.$Replace$the$inspection$cover.$
7.$Refill$the$water$heater,$and$restore$to$operation.$
8.$Verify$operation$of$boiler$and$water$heater.$
$
$!

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$11$
$
1%RA#H%,%)&!/#+&@!;-@&!

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$12$
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$
These$Heat?Flo,$Inc.$warranties$protect$your$indirect?fired$water$heater.$These$warranties$are$applicable$to$the$original$purchasers$only.$
K311342<!90=713J7!501!17"(8742(3;!:"3J7!
$
The$warranties$listed$in$this$section$shall$apply$to$Heat?Flo,$Inc.,$indirect?fired$water$heaters$used$in$a$residential$setting$by$the$original$
consumer$ purchases$ only.$ A$ “residential$ setting”$ as$ used$ herein$ shall$ mean$ usage$ in$ a$ single?family$ dwelling$ in$ which$ the$ original$
consumer$purchaser$of$the$indirect?fired$water$heater$resides$on$a$permanent$basis.$“Residential$setting”$shall$also$mean$usage$in$a$
multiple$family$dwelling$provided$that$a$ Heat?Flo,$Inc.$indirect?fired$water$ heater$services$ only$ one$(1)$ dwelling$in$ a$ multiple$family$
dwelling.$The$term$“residential$setting”$shall$not$include$any$usage$of$the$indirect?fired$water$heater$above$150$degrees$Fahrenheit.$
$
Heat?Flo,$Inc.$warrants$that$it$will$repair$or$replace,$at$its$option,$without$charge,$any$defective$or$malfunctioning$component$of$the$
water$heater$during$the$first$year$after$the$original$date$of$installation$in$the$dwelling.$It$is$expressly$agreed$between$Heat?Flo,$Inc.$and$
the$original$consumer$purchaser$that$repair$or$replacements$are$the$exclusive$and$sole$remedy$of$the$original$consumer$purchaser.$
$
During$the$remaining$lifetime$of$the$water$heater,$Heat?Flo,$Inc.$will$repair$or$replace,$at$its$option,$without$charge,$any$water$heater$
having$a$defect$or$malfunction$that$results$in$a$water$leak$from$outer$the$jacket,$inner$tank,$or$heat$exchanger$as$a$result$of$normal$use$
and$service.$It$is$expressly$agreed$between$Heat?Flo,$Inc.$and$the$original$consumer$purchaser$that$ the$repair$or$replacement$is$the$
exclusive$and$sole$remedy$of$the$original$consumer$purchaser.$
$
Should$ a$ defect$ or$ malfunction$ result$ in$ a$ leakage$ of$ water$ within$ the$ above?stated$ warranty$ periods$ due$ to$ defective$ material$ or$
workmanship,$ malfunction,$ or$ failure$ to$ comply$ with$ the$ above$ warranty,$ such$ defect$ or$ malfunction$ having$ been$ verified$ by$ an$
authorized$ Heat?Flo,$ Inc.$ representative,$ then$ Heat?Flo,$ Inc.$ will$ replace$ the$ defective$ or$ malfunctioning$ water$ heater$ with$ a$
replacement$water$heater$of$the$nearest$compatible$model$available$at$the$time$of$replacement.$
$
If$Heat?Flo,$Inc.$is$unable$to$repair$or$replace$a$water$heater$so$as$to$conform$to$this$warranty,$after$a$reasonable$number$of$attempts,$
then$Heat?Flo,$Inc.$will$provide$at$its$option,$either$a$replacement$product,$or$a$full$refund$of$the$purchase$price.$These$remedies$are$
the$consumer$purchaser’s$exclusive$remedies$for$breach$of$the$warranty.$
$
K311342<!90=713J7!501!90..719(3;!:"3J7!
$
The$warranties$listed$in$this$section$shall$apply$to$Heat?Flo,$Inc.$water$heaters$used$in$a$commercial$setting$by$the$original$consumer$
purchasers$only.$A$“commercial$setting”$as$used$herein$shall$mean$any$usage$not$falling$within$the$above$definition$of$a$“residential$
setting”.$A$Heat?Flo,$Inc.$water$heater$shall$be$deemed$used$in$a$“commercial$setting”$if$at$any$time$it$is$operated$at$a$temperature$
above$150$degrees$Fahrenheit.$
$
Heat?Flo,$Inc.$ warrants$ that$ it$ will$repair$or$replace,$at$its$option,$without$charge,$any$defect$or$malfunctioning$of$the$water$heater$
during$the$first$year$after$the$original$date$of$delivery$to$the$original$consumer$purchaser.$It$is$expressly$agreed$between$Heat?Flo,$Inc.$
and$ the$ original$ consumer$ purchaser$ that$ the$ repair$ or$ replacement$ is$ the$ exclusive$ and$ sole$ remedy$ of$ the$ original$ consumer$
purchaser.$
$
During$the$second$through$fifth$years$after$the$original$date$of$delivery$to$the$original$consumer$purchaser,$Heat?Flo,$Inc.$will$repair$or$
replace,$ at$ its$ option,$ without$ charge,$ any$ water?heater$ having$ a$ defect$ or$ malfunction$ that$ results$ in$ a$ water$ leak$ from$ the$ outer$
jacket,$ inner$ tank,$ and$ heat$ exchanger$ as$ a$ result$ of$ normal$ use$ and$ service.$ It$ is$ expressly$ agreed$ between$ Heat?Flo,$ Inc.$ and$ the$
original$consumer$purchaser$that$the$repair$or$replacement$is$the$exclusive$and$sole$remedy$of$the$original$consumer$purchaser.$
$
Should$ a$ defect$ or$ malfunction$ result$ in$ a$ leakage$ of$ water$ within$ the$ above?stated$ warranty$ periods$ due$ to$ defective$ material$ or$
workmanship,$ malfunction,$ or$ failure$ to$ comply$ with$ the$ above$ warranty,$ such$ defect$ or$ malfunction$ having$ been$ verified$ by$ an$
authorized$Heat?Flo,$Inc.$representative,$then$Heat?Flo,$Inc.$will$replace$the$defective$or$malfunction$water$heater$with$a$replacement$
indirect$water$heater$of$the$nearest$comparable$model$available$at$the$time$of$replacement.$
$
If$ Heat?Flo,$ Inc.$ is$ unable$ to$ repair$ or$ replace$ the$ water$ heater$ so$ as$ to$ conform$ with$ this$ warranty$ after$ a$ reasonable$ number$ of$
attempts,$ then$ Heat?Flo,$ Inc.$ will$ provide,$ at$ its$ option,$ either$ a$ replacement$ product,$ or$ a$ full$ refund$ of$ the$ purchase$ price.$ These$
remedies$ are$ the$ exclusive$ remedies$ of$ the$ original$ consumer$ purchaser$ See$ reverse$ side$ for$ exclusions,$ limitations,$ remedies$and$
service$request$information.$
Bulletin$WAR?071514$$$$Page$1$of$2$
$$
$

Heat?Flo,$Inc.$|$Hot$Water$Storage/$Booster$Tanks$ $ Page$|$13$
WHAT IS NOT COVERED BY EITHER OF THESE WARRANTIES
Heat-Flo, Inc. does not warrant:
1. Defects or malfunctions resulting from improper installation or failure to maintain and operate an indirect-fired water heater in
accordance with the printed instructions which accompany the water heater.
2. Defects or malfunctions resulting from consumer damage, such as: (A) improper maintenance or (B) misuse, abuse, accident, or
alteration.
3. Defects or malfunctions on indirect-fired water heaters where the original serial number cannot be readily determined.
4. Service calls not involving malfunction or defects in materials or workmanship, and the original consumer purchaser shall pay for
such calls.
5. Water heaters installed outside of the United States and Canada.
6. Water heaters repaired or altered without prior written approval of Heat-Flo, Inc. so as to affect adversely their reliability.
7. Components of an indirect-fired water heater which are not defective, but must be replaced during the warranty period as a result of
reasonable wear and tear.
8. Components of an indirect-fired water heater which are subject to warranties, if any, given by their manufacturers. Heat-Flo, Inc.
does not adopt these warranties.
9. Malfunctions resulting from, or repairs necessitated by, a failure to maintain an indirect-fired water heater free of water sediments or
scale deposits.
10. This warranty does not extend to labor costs, shipping charges, delivery expenses, or administrative fees incurred by the original
household consumer purchaser in repairing or replacing an indirect-fired water heater.
Heat-Flo, Inc. will not accept claims for labor costs incurred by the original consumer purchaser in removing or reinstalling
an indirect-fired water heater.
11. Malfunctions resulting from, or repairs necessitated by, uses of the indirect-fired water heater for purposes other than that for which
it was designed, or resulting from flood, fire, wind, or lightning.
OWNER’S RESPONSIBILITIES
The owner or installer must:
1. Have the storage tank installed with a vacuum relief valve and a temperature and pressure relief valve in accordance with local,
state, and federal codes and ordinances bearing the listing marks of the American Society of Mechanical Engineers (A.S.M.E).
2. Operate the storage assembly at a pressure below that shown on the rating plate on the pressure relief valve.
3. Keep the tank free of scale deposits.
4. Make provisions so if the tank or any component part or connection should leak, the resulting flow of water will not cause
damage to the area in which it is installed.
The warranty hereunder does not apply to defects resulting from:
1. Freezing, excessive pressure, or leaks at water connections.
2. Failure of a component, control or component part other than a component part manufactured solely by HFI.
3. Any cause similar to the above, not resulting solely due to defective material and/or workmanship.
4. Water Quality: The warranties extended by HFI are conditioned upon potable water with a Ph not to exceed 8.0 and not below 6.0,
and/ or chloride concentrations not to exceed 100 parts per million (ppm). HFI specifically disclaims liability of any kind resulting
from or relating to potable water that does not match these characteristics.
LIMITATION OF WARRANTIES AND REMEDIES
THE FOREGOING 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 PARTICULAR PURPOSE, AND ANY OBLIGATION, LIABILITY, RIGHT, CLAIM, OR REMEDY IN CONTRACT OR TORT,
WHETHER OR NOT ARISING FROM HEAT-FLO, INC.’S NEGLIGENCE, ACTUAL OR IMPUTED.
THE REMEDIES OF THE ORIGINAL CONSUMER PURCHASES SHALL BE LIMITED TO THOSE PROVIDED HEREIN TO THE
EXCLUSION OF ANY OTHER REMEDIES INCLUDING WITHOUT LIMITATION, INCIDENTAL OR CONSEQUENTIAL DAMAGES
INCLUDING, BUT NOT LIMITED TO, PROPERTY DAMAGE, LOST PROFIT, OR DAMAGES ALLEGED TO HAVE BEEN CAUSED BY ANY
FAILURE OF HEAT-FLO, INC. TO MEET ANY OBLIGATION UNDER THIS AGREEMENT INCLUDING THE OBLIGATION TO REPAIR AND
REPLACE SET FORTH ABOVE.
NO AGREEMENT VARYING OR EXTENDING THE FOREGOING WARRANTIES, REMEDIES, OR THIS LIMITATION WILL BE BINDING
UPON HEAT-FLO, INC. UNLESS IN WRITING AND SIGNED BY A DULY AUTHORIZED OFFICER OF HEAT-FLO, INC.
THE WARRANTY STATED HEREIN IS NOT TRANSFERABLE AND SHALL BE FOR THE BENEFIT OF THE ORIGINAL CONSUMER
PURCHASER OF A WATER HEATER ONLY.
These warranties give you specific legal rights, and you may also have other rights which vary from state to state. Some states do not allow
the exclusion or limitation of incidental or consequential damages so this limitation or exclusion may not apply to you.
These are the only written warranties applicable to water heaters manufactured and sold by Heat-Flo, Inc. Heat-Flo, Inc. neither assumes nor
authorizes anyone to assume for it any other obligation or liability in connection with said water heaters.
SERVICE REQUESTS
FOR SERVICE UNDER THESE WARRANTIES CONTACT HEAT-FLO, INC., AT THIS ADDRESS:
Heat-Flo, Inc., P.O. Box 612, Uxbridge, MA 01569
At the time a claim is filed the original consumer purchaser must present a copy of the original sales receipt, and a deed, utility bill, or
equivalent document evidencing both ownership of the water heater and installation in the dwelling or commercial property owned by the
original consumer purchaser. With regard to claims made by original consumer purchasers of water heaters used in commercial settings as
that term is defined herein, in no event shall notification of a service request be received later than five years from the date of purchase.
The obligations under this warranty apply only to domestic hot water tank installations where the warranty registration card has been
completed by the owner of the site of the original installation and received by Heat-Flo in accordance with the terms and conditions herein set
out and Heat-Flo has been notified of the alleged defect or deficiency within forty eight (48) hours from the occurrence or discovery of the
alleged defect or deficiency. Heat-Flo, Inc. reserves the right to change specifications or discontinue models without notice.
Bulletin WAR-071514 Page 2 of 2

Heat-Flo, Inc.
15 Megan Ct., P.O. Box 612, Uxbridge MA, 01569, USA
Phone: [phone] | Fax: [phone] | e-mail: sales@heat-o.com
www.heat-o.com
Providing Solutions through Superior Design.