Forum Archive

I have read the past posts on tankless water heaters, but still have a few questions: I have a four story, two family house with gas forced air heat and a gas traditional tank water heater. I am not going to be replacing a boiler or hot water heating system: just the hot water heater. I am trying to find out if replacing it with a tankless hot water heater makes sense.

The house has two complete kitchens, one laundry room, four bathrooms – and at home residents who use hot water at all times of the day.

Experienced plumbers: will I use more energy with a tankless, which National Grid tells me uses a massive amount of energy to heat water on demand, than I would a new high recovery hot water heater? Will I have to invest in the re-lining or installation of new vents for a tankless system?

Most of the particulars I can find refer to systems that are tied in with hot water house heating systems. For those of us with forced air systems: what hot water replacement is best?