Post on 11-Oct-2020
AGuidetoElectricWaterHeatersforRetrofitsandNewConstruction
IntroductionThepurposeofthisdocumentistoprovideelectricchoicestogaswaterheaters,fromtinytankstowaterheatersforhighrises.Thislistincludestanklesswaterheatersonemightuseincommercialbathrooms,smallresistancestoragetanks(e.g.underatinyhousekitchensink),heatpumpwaterheaterswithintegratedtanks(commoninnewhomes),heatpumpwaterheatersusingremotetanks(helpfulforretrofits),largerwaterheaterforwhole-househydronicHVAC,andthelargestcommercialwaterheatersyoumightfindincafeterias,restaurants,hotelsandapartmentbuildings.
ThisdocumentwasassembledbyRedwoodEnergy’sSeanArmstrong,JennaBader,LynnBrown,ChelseaHernandez,EmilyHigbee,KevinMiller,KathrineSanguinetti,andKaileighVincent-Welling.Itisfreeforuse.
VoltageRequired:120VThebelowelectricresistancewaterheatersarebestusedwherehotwaterisneededinsmallamounts,suchashandwashingincommercialbathrooms,ora120sftinyhousethathasnoroomfora50-gallonheatpump.Electricresistanceuses3-5xmoreenergythanaheatpumpdoingthesameheating,butsometimestheyaretheonlywaterheatersright-sizedtothewaterdemand.Theymightalsobehelpfulwhenthereisno220Velectricityavailable—the2-10-gallontanksonthemarketuse120V,whileanythinglargeruses240Vformoreheatingcapability.
Model Picture WaterHeaterType
TankCap.(gal)
HeatCap. Power(KWorBTU)
MaxAmp
COPorEF
RefrigerantType
Dimension
StiebelEltronDHC3-1
TanklessWaterHeater
0.32gal 3.0kW 25A 98% HeatElement
36.0cmx77/20.0cmx41/8˝/10.4cm
BoschTronic3000TMini-TankSeriesES8SeriesES4SeriesES2.5
7gal4gal2.7gal
1440Watts 12A 98% 17½"x17½"x14½"13¾"x13¾"x13½"13¾"x13¾"x10¾"
StiebelEltronMini™2-1120Volt(110V)
PointofUseTanklessWaterHeater
0.21GPM
15 98%
StiebelEltronSHC-2.5SHC-4SHC-6
Mini-TankPoint-of-UseWaterHeater
2.65gal4gal6gal
1.8KW/50-60Hz15AMPS
11.3
98% 18.7Hx11Wx10.6"19.75Hx12.6Wx12.5D"201/2"Hx151/8"Wx15"D
RedwoodEnergy
VoltageRequired:240VThebelowwaterheatersallrelyuponheatpumps—noresistancemodelsareshownduetotheirinefficiencyandnear-prohibitionagainstinstallationinCalifornia.Theseheatpump(akacompressor)waterheatersrelyon30-80gallonsofwaterstorage,andcollect3-5unitsofheatforeveryoneunitofelectricitypoweringtheairsourceheatpump.Somehavea4000BTUcompressorintegratedontopofthetank,othersusea12,000-36,000BTUseparatecompressoroutsidethatproducesmoreBTUsandatahigherefficiency.Thereisaheatpumpwaterheaterforeveryapplication,includingsupplyinghotwaterforhydronicspaceheatingaswellasdomestichotwater,andforeverylocation.Evenatankburieddeepinahousecanbeplumbedwithhotwaterproducedbyaremotecompressor,orgivenairviaductkitsprovidedbythemanufacturers.
Model Picture WaterHeaterType
TankCap.(gal)
HeatCap.
Power(KWorBTU)
MaxAmp
(COP)orEF
Refrigerant Dimension
StiebelEltronACC300Accelera300ElectricWaterHeater
HybridHeatPumpWaterHeater
80 SinglePhase/220-240V/60
Hz2.15KW15AMPS
15Amps
EF3.39
751/4"Hx26"Dia(191.3x66cm)
StiebelEltronAccelera220EHeatPumpWaterHeater
HybridHeatPumpWaterHeater
58 SinglePhase/220-240V/60
Hz2.15KW15AMPS*
15Amps
EF3.05
6013/16"Hx273/16"Dia(154.5x69cm)
SandenCO2GAUS-160QTASAN-43SSAQAGAUS-315EQTDSAN-83SSSAQA
HeatPumpWaterHeater
4343
8383
15,400BTU/H
R
208/230v-1P-60Hz
15Amps
7.7Amps
EF3.09(5)3.84(5)
CO2R744 47.25”H:22.5”D38.13”H:24.5”D58.63”H:26.75”D68.88”H:24.5”D
VKINSplit-SystemWaterHeater
HeatPumpOnlyWaterHeater
30406580
8600BTU/H
R
Singlephase/230V/60Hz
1250W3.37
2.06-5.72Amp
Models
COP3.24-3.9
WH:31.2”21.5”Hx9.8”D
RheemPrestigePROPH50PROPH65PROPH80T2RH350D
HybridHeatPumpWaterHeater
506580
240V
15Ampand30Amp
models
UEF3.553.703.70
61"H-22-1/4"D64"H-24-1/4"D74"H-24-1/4"D
RheemPerformancePlatinumXE50XE65XE80
HybridHeatPumpWaterHeater
506580
240V
15Ampand30Amp
models
UEF3.553.703.70
61"H-22-1/4"D64"H-24-1/4"D74"H-24-1/4"D
A.O.SmithVoltexHybridHPTU-50NHPTU-66NHPTU-80N
HybridHeatPumpWaterHeater
506680
0.490kW
208/240V60Hz
30Amps
EF3.613.443.27
R134a 63''H-22''W61''H-27''W69''H-27''W
PHNIXPASHW008-200LD(E)PASHW008-300LD(E)
HybridElectricHWaterHeaterwithSolarthermalheating
5080
140°F 1.5kW(LowerElement)
2.0-0.55kW(HeatPump)
EF3.0EF3.2
HeatingElement
69.5”,43.75”,D:22”74”,47.62”,D:25”
RedwoodEnergy
Company Model Type Voltage Refrigerant Heating
Capacity(MBH)
CoolingCapacity(MBH)
HotWaterFlow
OPTempRange
COP
AERMECANK
030 HeatPumpAir/WaterOutdoorinstallation(a)withstorage
208/230 R134A 37.7 37.7 6.0/8.4 44.6-113F 3.4
045 52.0 52.0 8.0/11.5 44.6-113F 3.63
050 57.6 57.6 9.5/12.8 44.6-113F 3.73
CHILLTRIX
CX34 Ultra-EfficientCX34ChillerHeatPumpHPWHwithSolar
115v50/60Hz(220v50/60Hz)
R410a 8.6 8.6 7.6 -20~50 3.92
PHNIX
010B HPWH 220-240 R134A 13.0 13.0 66.62 -7-45 4.18
015B 19.6 19.6 99.92 -7-45 4.18
020B 23.2 23.2 118.24 -7-45 4.12
030 32.4 32.4 163.21 -15-45 4.0
050S 380-415 58.7 58.7 308.10 -15-45 4.53
Spacepak
SolsticeExtreme
208/230 R134A 48 10-14 42-140 4
SolsticeSE 44/34 7-12 36-125 4
SunPump
VRHA-12DC80G
WHTYPE:SolarHeating(mountedontheroof,walls,orparkinggarages)InovativeSP#Chargesthermalbatterytank(2.47W/gal/deg.diff)
2panels liquid1/4,gas3/8
11.9
VRHA-18DC80G
3panels liquid1/4,gas1/2
17.1
VRHA-24DC80G
4panels liquid3/8,gas3/8
23.9
VRHA-36DC80G
6panels liquid3/8,gas5/8
34.1
VRHA-48DC80G
8panels liquid1/2,gas3/4
47.8
LargeBuildingApplications:240V-480VApartmentbuildings,hotelsandlargecommercialfacilitiesusuallyheatwaterinacentralplantand
plumbitthroughoutthebuilding.Theselargeheatpumpsrangefrom10tonsto260tons(1ton=12,000BTU/Hr)andlikeanycentralsystemtheyrequirecarefuldesignofthepumps,heatexchangersandstoragetanks.Designsthatdon’treturncooledwatertothecompressorscanleadtoovercompression,soabestpracticeistoreduceBTUproductionandincreasestoragetomeetpeaks.
Therangeofoperatingtemperaturesisimportant—eachproducthasadifferentmaximumoutput
temperature,between120Fand180F,andaminimumoperatingtemperaturebetween5Fand45Fbeforeitswitchesofftheheatpumpandusesresistance.Aresistanceelementat2-4xtheenergyofaheatpump.
RedwoodEnergy
Company Model Type Voltage Power(W)
Refrigerant Heating/Cooling(tons)/(MBH)
Flow(GPM)
TemperatureRange
OPTempRange
COP
AERMECNRK
02000280
HPWH 2303P460575
12.117.1
R410A 12.0/12.317.0/12.0
31.644.3
53.6/44.6105/113
3.493.49
03000330
20.022.5
19.8/12.422.3/12.1
51.757.5
53.6/44.6105/113
3.483.48
0350050005500600
25.5303540
25.0/11.829.6/12.133.8/12.039.0/11.7
68.380.091.0102.2
53.6/44.6105/113
3.453.443.433.43
06500700
4550
44.4/12.049.8/11.6
117.6130.6
53.6/44.6105/113
3.423.38
AERMECNRP
0280E HeatPumpAir/WaterOutdoorinstallation(a)withstorage
208/230
R134A 184.01/12.02 40.3 3.130300E 213.4/14.12 47.6 3.140330E 242.8/16.09 54.7 3.140350E 305.0/20.09 69.4 3.270500A 328.5/21.34 72.9 3.100550A 381.8/24.83 89.0 3.060600A 479.8/32.61 109.0 3.020650A 536.8/36.28 123.5 3.070700A 591.1/39.91 137.6 3.060750A 660.8/44.89 151.2 3.05
ColmacHPWSinglecircuit
HPW2 HPWH 208/230
R134A 37/29 1 140-160F
4.8/3.8
HPW4 73/60 2.1 140-160F
5.9/4.9
HPW7 119/97 3.4 140-160F
5.3/4.3
HPW9 135/109 3.9 140-160F
5.1/4.1
HPW12
219/178 6.3 140-160F
5.5/4.5
HPW15
289/233 8.3 140-160F
5.2/4.2
ColmacHPWHMultiCircuit
HPW8M
HPWH 208/230
R134A 149/121 1 140-160F
5.9/4.9
HPW24M
438/357 2.1 140-160F
5.5/4.5
HPW30M
578/467 3.4 140-160F
5.2/4.2
HPW36M
657/536 3.9 140-160F
5.5/4.5
HPW60M
1000/800 6.3 140-160F
5.2/4.2
HPW8M
149/121 1 140-160F
5.9/4.9
HPW24M
438/357 2.1 140-160F
5.5/4.5
Mayekawaunimo“EcoCute”
unimoA/W
HPWH 480VAV3p
165AMPS
R744(CO2) 273.0 8.7
HE-HWAW-2HTCAWW
296.2