I'm hoping to install a tankless water heater, and I'm trying to figure out if my current gas meter can handle it. So I'm trying to figure out how much gas my furnace uses.
It's a Goodman GMH950703BXAD. The label says the max temp rise is 69,000 BTU/hour, and the EnergyGuide sticker says it's 98% efficient. Am I right in thinking this means a max gas usage of about 70,500 BTU? (69000 / 98) * 100 = 70408
In response to comments about pipe size, it's 1" pipe coming off the meter. This is about 30', then it reduces to 3/4" at an old unused T, and it's about 25' of 3/4". The furnace and water heater are both at the end of this. So I've already got the required 3/4" gas supply, and it wouldn't be out of the question to extend the 1" line the entire distance if that would help.
Best Answer
The gas meter usually is not the problem it is the gas line either through the house or the connection size and the size of the line you install. A minimum 3/4" gas line to the new water heater is required. And the line you pipe into should be at least 1 inch. Any thing smaller and you will not have enough gas flow. The main gas line in the house should be at least 1 inch. You could call the gas company and see if they can raise the gas pressure to your house. 8 ounces used to be the maximum.