I have installed sevral tankless water heater and now did one for myself. It was so easy to hook them up and wak away but now I need to learn to care for one. Who has some advice on the care and feeding of a tankless heater?

Iv'e installed tankless water heaters and have nothing but the nicest things to say about them. True they cost from $500 for a three element to $600 for a top of the line four element. But consider, they will last 30 to 40 years compared to 8 or 9 of a regular heater. Expect a savings of 40 to 60% on your electric water heater bill.(Figure the savings over the years plus the replacement cost of heaters and it begains to pay for itself.) This unit will not leak or rupture and stays 99.5% efficient through out its lifespan. I have installed small "kicker units" to boost hot water to a far bathroom to a full size unit that handles a 4 bedroom house.
You may send my tip directly to Paypal. Make it a big one. I'm looking at a Vette. Tom

Ballenberg: what tankless hot water heaters are you talking about ? The point-of-use electric heaters? Or gas tankless heaters like Noritz, Takagi, Rinnai, Rheem, Bradford White, Bosh, Paloma... etc.. Which one did you install ? Our company installs tankless heaters since 2002 - the year they have been introduced on market in So.California.