"sf" > wrote in message
>> You can add a circulation pump to a traditional standing water heater
>> tank. It's actually a very easy DIY. More difficult plumber job for the
>> tankless. The pump is installed under a sink furtherest from the tank.
>> You need an electrical source. It has a thermostat and when water in
>> the line cools it pulls hot water from the tank and pushes the cooled
>> water through the cold side back to the tank. I have had one before and
>> it works well.. not this brand though.
>>
>> http://tinyurl.com/bnrvhdd
>>
> I looked it up immediately after I posted and found this one
> http://www.rewci.com/whhohotwaci.html Looks like a great idea and not
> expensive at all. I wonder why they aren't touted more?
>

That is a very interesting system. Used to be, you needed a return line and
it was a fairly expensive installation. This setup eliminates that.

The need also varies with the layout of the house. My hot water is located
fairly close to both bathrooms and kitchen so I don't see the need. In a
house that is very long and utilities at the far end, it can be a long wait
for the hot water. and perhaps can be justified.