Work sheet To compare BTU cost

Work sheet to compare BTU cost

System Type	BTU's per unit	A Natural gas water heater will use $200-$400 worth of gas a year or $17-$33 a month depending on number of people and their habits. A Propane gas water heater will use $350-$550 worth of gas a year or $29-$45 a month depending on number of people and their habits.
Propane	91,500 BTU's per gallon
Natural Gas	100,000 per therm cubic foot
Heating Oil	138,500 BTU's per gallon

1. Monthly or yearly cost / Price per unit = Total number of units

2. Total number of units x BTU's per unit x system efficiency = Total number of BTU's used to heat your home

3. Total number of BTU's / 100,000 BTU's = B

4. B x $.31 = monthly or yealy cost of Earthlinked DX Geothermal System operating cost

Example

$125 monthly bill using natural gas furnace that is 90% efficient. Price per therm cubic foot = $1.00

1. $125 / $1 = 125 therm cubic feet

2. 125 therm cubic feet x 100,000 BTU's per therm cubic foot x 0.90 = 11,250,000 BTU's

3. 11,250,000 BTU's / 100,000 BTU's = 112.5

4. 112.5 x $.31 = $34.88 a month

To compare just click on this link Earthlinked DX Geothermal calculator and click on run