Re: Not Really
[QUOTE=hvhehcca;243383]Fuel source has no bearing. A btu is a btu whether produced by a kw or a therm.
gpm = Temp Rise x 500 divided by btu
If electric and the unit is 20kw then it can produce roughly 68,000 btu's. 1 kw = 3,418 btu's. Temp rise is relevant to the climate location and set point. If I use my area the math would be
gpm = (70 x 500) divided by 68,000
This unit can only produce 1.9gpm[/QUOTE]
That is my point if it's gas it can produce a higher BTU rating then most residential electric tankless heaters. Giving it a higher GPM rate. How can we tell what flow rate the heater can produce without knowing it's BTU rating?