Greening Electric Water Heating Systems Green Bundles Combine Water Heating Technologies

SIR: Savings to Investment Ratio

Of Green Water Heating Systems Averaged Over 5 U.S. Climate Zones

Cilmate Zone Factor (CZFn) Ohio SIR Maine SIR New York SIR

**From “Electric Water Heating Situation Analysis” (EEI/DOE 12/6/96)**

Heavy Residential User of 6618 kWh/yr Costing $562.53 @ 8.5¢/kWh¹

System	Type	Measure Cost	Measure² Life (years)	Present³ Value Factor	Savings kWh/yr	E-SIR^4,5 kWh/$
NAECA Standard	66 gal. Tank Cost: $275	$500	10 (Gas: 9)	7.7 (7.1)		N/A
A	Multifunction HPWH	$1000	13	9.4	4100	38.6
B	Add-On HPWH	$860	15	10.4	3510	42.5
C	Solar [Thermal]	$2750	30	15.4	3080	17.3
D	GFX Model G3-60 or S4-60	$400	30	15.4	2250 PP&L: 2347	86.6 PP&L: 91.8
E	Tankless	$500	15	10.4	1280	26.5
F	Desuperheater	$600	13	9.4	1020	16.0
CD	Solar & GFX	$3150	30	15.4	5330	26.0
BD	HPWH & GFX	$1260	15	15.4	5940	72.4

Medium Residential User of 3764 kWh/yr Costing $318.75 @ 8.5¢/kWh

System	Type	Measure Cost	Measure Life (years)	Present Value Factor	Savings kWh/yr	E-SIR kWh/$
NAECA Standard	66 gal. Tank Cost: $275	$500	10 (Gas: 9)	7.7 (7.1)		N/A
A	Multifunction HPWH	$1000	13	9.4	2500	23.5
B	Add-On HPWH	$860	15	10.4	2070	25.1
C	Solar [Thermal]	$2750	30	15.4	2420	13.5
D	GFX Model G3-60 or S4-60	$400	30	15.4	1280 PP&L -1660 R-2000 - 1760^6,7,8	49.3 PP&L - 63.9 R-2000 - 67.8
E	Tankless	$500	15	10.4	1280	26.6
F	Desuperheater	$600	13	9.4	610	9.53
CD	Solar & GFX	$3150	30	15.4	3700	17.3
BD	HPWH & GFX	$1260	15	15.4	3350	40.8

FOOTNOTES

Estimates for whole-house On-Demand (Tankless) water heaters were substituted for Point-of-Use units because they also eliminate standby loss and have lower installed costs as compared to EEI/DOE estimates of $1800 & $1100 for multiple Point-of-Use units for heavy users & medium users, respectively.” (See Final Report for DOE/EEI Joint Water Heater Initiative, “Electric Water Heating Situation Analysis”, Reference #31186, Final Report to EEI/DOE December 6, 1996 by A.D. Little, Inc., Acorn Park, Cambridge, MA 02140-2390)
Measure Life (ML) in years from Final Report Appendix A, pg. 10.
Present Value Factor (PVF) = 20*[1-(1/1.05)^ML]**
E-SIR = (PVF)* (kWh savings)/(Measure Cost)
SIR = E-SIR * CZFn * kWhcost
Energy Savings for GFX & GAS Water Heater = 96 Therm; from Canadian R-2000/Energuide Credits.
E-SIR_GAS/GFX = 3.96 Therm/$
SIR_GAS/GFX = 3.96 @ $1/Therm
Example: Ohio SIR @ Ohio Edison Rate = 11¢/kWh in CZ₂

**Equations courtesy of Nick Milano, Energy Program Developer,

Ohio Office of Energy Efficiency, 614-466-8436 (Fax: 1864)

Return to Home Page

© 2005 Waterfilm Energy, Inc.