I started graphing our energy usage in anticipation of savings this winter. Already we have realized some savings from our tankless domestic water heater. Our gas consumption is now limited to our gas stove and oven, and our water heater.
Comparing the gas usage over the past two summers, our consumption has dropped from 8 therms per month average, to 2 1/2 therms average for the two summer months that I have of our new tankless water heater. Other factors that may influence our usage are a preheater for domestic water that is connected to the heat pump loop and picks up heat to make the water lukewarm from both the heating and the cooling cycles, when they are operational. This has the effect of halving the amount of energy required from the water heater to heat our water to 120 degrees. Also, we use the microwave in the new kitchen more than our previous kitchen to heat up items, and consequently use the stove that much less.
In the September and October bill, the therms increased to 4 and 6 therms. There was minimal air conditioning or heating for these two months to prewarm the domestic hot water. There also may have been an increase in my wife's use of the oven for baking.
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