Acceptable CCF usage for gas water heater?

ls3c6 said:

I take one shower per day and the unit consumes about .45ccf/day with an ambient temp of 60-70f, seem right?

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We use 35 therms/month for two of us to heat the water. Normal water usage is 100 gals. per person per day, with probably 2/3 rds of this being cold water.
1 Therm of energy can be had from approx. 100 cubic feet of natural gas.
The heater may run 5 min out of 7 hrs to make up for insulation loss.

Would you repeat that? :laughing:

I don't know the 95th percentile for resi. water usage; it's probably high, brought up by those with automatic sprinklers.