I put in a power vent when our electric water heater started on fire 8 years ago. I wanted to go tankless but it was cost prohibitive and I got a brand new unit off a plumber friend for 500$ and installed it myself (plumber ran a gas line for $150).
The electric savings were close to $50 a month. Family of 5.
My unit rarely runs when I am not using water. I never hear it running unless there is demand. It probably comes on the odd time while I'm not around but it is really efficient. I thought it was screwed this winter as it started leaking, but it turned out to be the plastic drain valve cracked which I replaced with brass. I had a good look inside with a camera and the interior had a fair amount of build up but no corrosion. I'm sure it will be good for another 8 years.
The build up would be a much bigger issue in a tankless. The hardness of your water should definitely be a factor in switching. Also consider the water temp coming in. They can only raise the temperature so much, and in the winter my supply is quite cold. I haven't heard of any issues from the few friends I know who have these, but you want to make sure your unit can handle it.
A power venting unit is a real nice middle ground, and if you are already plumbed for a tak they are pretty much a drop in. There is only one exhaust vent that needs to be added as they get their combustion air from inside so you never have the vent issues either.
I have a high efficient furnace and I am always messing around with it's vent in the winter and never an issue with the water heater.
|