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

Measure2

Life

(years)

Present3

Value Factor

Savings kWh/yr

 

SIR4,5

 

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 -

17606,7,8

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