SIR: Savings to Investment Ratio

For Parts of Ohio Within Climate Zone 2

Average U.S. SIR Maine SIR New York SIR Cilmate Zone Factor (CZFn)

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

Heavy Residential User of 6618 kWh/yr Costing $728 @ 11¢/kWh¹

System	Type	Measure Cost	Measure^2 Life (years)	Present^3 Value Factor	Savings kWh/yr	SIR^4,5
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	4.75
B	Add-On HPWH	$860	15	10.4	3510	5.23
C	Solar [Thermal]	$2750	30	15.4	3080	2.12
D	GFX Model G3-60 or S4-60	$400	30	15.4	2250 PP&L: 2347	10.7 PP&L: 11.3
E	Tankless	$500	15	10.4	1280	3.26
F	Desuperheater	$600	13	9.4	1020	1.97
CD	Solar & GFX	$3150	30	15.4	5330	3.20
BD	HPWH & GFX	$1260	15	15.4	5940	8.90

Medium Residential User of 3764 kWh/yr Costing $414 @ 11¢/kWh

System	Type	Measure Cost	Measure Life (years)	Present Value Factor	Savings kWh/yr	SIR
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	2.89
B	Add-On HPWH	$860	15	10.4	2070	3.09
C	Solar [Thermal]	$2750	30	15.4	2420	1.65
D	GFX Model G3-60 or S4-60	$400	30	15.4	1280 PP&L -1660 R-2000 - 1760^6,7,8	6.06 PP&L – 7.86 R-2000 - 8.34
E	Tankless	$500	15	10.4	1280	3.28
F	Desuperheater	$600	13	9.4	610	1.17
CD	Solar & GFX	$3150	30	15.4	3700	2.12
BD	HPWH & GFX	$1260	15	15.4	3350	5.02

FOOTNOTES

1. 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 & $1100 for multiple Point-of-Use units for heavy users & medium users, respectively.” (See Final Report for DOE/EEI Joint Water Heater Initiative, “Electric Water Heating Situation Analysis”, Reference #31186, Final Report to EEI/DOE December 6, 1996 by A.D. Little, Inc., Acorn Park, Cambridge, MA 02140-2390)
2. Measure Life (ML) in years from Final Report Appendix A, pg. 10.
3. Present Value Factor (PVF) = 20*[1-(1/1.05)^ML]**
4. E-SIR = (PVF)* (kWh savings)/(Measure Cost)
5. SIR = E-SIR * CZFn * kWhcost
6. Energy Savings for GFX & GAS Water Heater = 96 Therm; from Canadian R-2000/Energuide Credits.
7. E-SIR_GAS/GFX = 3.96 Therm/$
8. SIR_GAS/GFX = 3.96 @ $1/Therm

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

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

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