[4RE KLR]

They work great, they are very durable and are energy efficient.

The whole house unit is the way to go if you can get the plumbing to work for you. They are easy to change when they go out. (hardly ever, but I have seen it happen)

If possible you may choose to go with a gas version as opposed to electric. The gas models are much more energy efficient and last many times longer than the electric ones do.

The gas ones come on heat the water and then turn off. No waste of energy.

I have put them in recirculating systems very successfully in many homes. The units come on and heat the water in the lines until it reaches a predetermined temp then it turns off. When you turn on a faucet you have instant hot water and the system resupplies the lines before the water gets cool again.

It is a win/win.