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