domestic hot water recirc for radiant floor/wall

ALH_4

Generally using potable water for heating or cooling is considered unsafe. There is the possibility of Legionella bacteria growing in the heating system.

You could use a water heater like the <a href="http://www.bradfordwhite.com/images/shared/pdfs/specsheets/546B.pdf"target="_blank">Combi2</a> or pipe an external heat exchanger off the side of the water heater.

Bigheadtodd_2

domestic hot water recirc for radiant floor/wall


Working on a project with scorched air. Was asked if I could provide a warm shower floor and bench as well as a small area of wall space next to a tub. I was thinking I could do it with the domestic hot water recirculateing piping.

Does anyone have any ideas for me? I thought I would place tube in the shower floor sub strate no big deal, thought I could do a radiant wall around the tub, would do 3 walls.

I'm not sure how to control, not sure about what size pipe to use and how long I should run the loop lengths.I would want to pipe the floor and wall and then continue on to the rest of the fixtures.

Also,what about supply temperature?

I will be useing Aquapex. I normaly run 3/4 for the return on the recirc line. I'd like to use heat transfer plates for the wall, but I dont think they make 3/4 plates??

This is a 3 story condo, water heater is on first floor. Because of ducts in the way, I will have 2 recirc lines returning to the water heater. Water heater will have supplemental hot water by way of solar storage.

Any help would be much appreceiated. Thanks Todd

Mike T., Swampeast MO

May be a good application for electric mats/cables.

Shower floors generally have some sort of truly water proof "pan" surrounding a water-resistant base. Not particularly easy to get pipes into the base without penetrating the waterproof pan thus making it less than waterproof...