1

Annual mortgage interest rate (%100):

0.14

2

Term of mortgage (Years)

20

3

Down payment (as fraction of investment %100):

0.1

4

Collector area dependent costs (Monetary unit per m².):

15,000

5

Area Independent costs (Monetary unit):

20,000

6

Present cost of solar backup system fuel (Monetary unit per Giga Joule):

1280

7

Present cost of conventional system fuel (Monetary unit per Giga Joule)

1280

8

Efficiency of solar backup furnace (%100):

0.7

9

Efficiency of conventional system furnace (%100):

0.7

10

Property tax rate as fraction of investment (%100):

0

11

Effective income tax bracket (%100):

0

12

Extra ins., maint. & parasitic costs (as fraction of investment %/100):

0.1

13

General inflation rate per year (%/100):

0.165

14

Solar backup fuel inflation rate per year (%/100):

0.2

15

Conventional system fuel inflation rate per year (%/100)

0.2

16

Discount rate (after tax return on best alternative investment %/100):

0.8

17

Term of Economic analysis (Years):

20

18

Depreciation lifetime (Years)

20

19

Salvage value (as fraction of investment %/100)

0.2

20

Market Discount Rate (%/100):

0.08