Generally speaking, replacing a decent tank water heater with a tankless one will not save you much, even in the long run (check Consumer Reports). All that being said, I just recently replaced my entire hot water and forced-air heating system with a Rinnai tankless condensing water heater (95% efficient) coupled to two Rinnai hydronic forced air furnaces. I use natural gas and have a 3000 sq ft home in the Northeast. The Rinnai efficiently sends 140-degree water to the furnaces to heat the house. The 140-degree water is reduced to 120-degrees by mixing with cold water to supply my hot water needs. Amazingly efficient system. However, I don't think a tankless heater just to supply your hot water needs would be a good choice in TV. It will cost you at least double that of a tank system.
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