There are two basic types of tankless water heaters.
Tankless water heater furnace.
Gas tankless water heaters are less expensive to operate but they typically require venting outdoor models are the notable exception.
Plus you never have to worry about running out of hot water with a rinnai tankless water heater because it keeps heating as long as it is needed.
Rinnai s ultra line of water heaters are rated at up to 96.
Gas including both natural gas and propane lp and electric which comes in both whole home and point of use configurations.
Water heating for the future.
Noritz has been an innovator in the water heating industry for over 60 years.
The rheem eco200xln3 1 outdoor natural gas tankless water the rheem eco200xln3 1 outdoor natural gas tankless water heater can provide up to 9 5 gpm at a 35 temperature rise.
So if gas costs 0 96 therm then a 96 tankless water heater or forced air furnace will cost about 1 00 per therm plus about 5 or 6 cents per therm for blower energy assuming ecm.
Btw at 10 cents a kwh a 15 seer single stage heat pump costs about 73 cents therm 10 x 29 3 4 cop.