We have had it for 13 years--we put it in when we built the house. We've been very pleased with it--I like that the unit is in the basement and not exposed to the elements outside. It's quiet and efficient and since our power is provided by a rural electric company (which is more expensive than the bigger companies), it makes a difference. It does cost more to put in but recoups that in savings. Our water heater is connected to it and it keeps a consistent temperature. I don't think you'll be disappointed with it.