Print

[caper]

Hello all, another question, i have a heatmaster 5000, worked great last year ,no issues what soever, im still wrapping my head around the system,anyway, do u really need mixing valves , some heat guys say no, some say , omg you dont have any mixing valves, so heres my system, new home,3800 sq feet, true in floor heating in basement and gargage, in truss heating in bathroom and kitchen,all other loops are cast iron low boys, each loop is seperate, so im good there ,however the water temp is the same in all,furnace to be set this year at 175-15 diff, so my question is will the hot water be too hot for my in floor, last yr had no issues, the floor wasnt too hot or anything like that,neither was the rads, i do realize i loose some temp before it get to the house,but really do i need the mixing valves or is that jus a scam, as my system works well with no issues at all.thanks for the help everyone..

[Speed]

If I'm understanding you correctly, you are thinking about putting mixing valves in your floor heat lines? Can't see any reason why you would want to. It would be like putting ice cubes in front of heat registers. Mixing valves are for domestic hot water, they add cold water to the hot before it heads out to your faucets kind of like an anti scald protection.

[beeman]

mixing valve is only used if using sidarm on hot water heater dont want that kind of heat at sink third degree burn in 3 second

[Scott7m]

Mixing valves are common place In radiant floor systems to keep the in floor heating from becoming to hot.  Most radiant floor heating is done with a water temp of around 110-115.  I know some folks who go higher but there are a lot of problems that it can cause to run temps that hot under your floors.

A scam?  It's one of the most widely used common parts in any radiant system

This all goes back to what I often say on here, "just because your warm don't mean it's done right". 

Wish we knew more about your system and how it was distributing its heat from the boiler.

[yoderheating]

 Scott is correct, mixing valves are used in most radiant infloor systems. If you are doing infoor concrete you have to use it, if its under hardwood or tile floors you also should have it.

[Speed]

That's interesting. I'd have never thought they'd be used there. How does it work in that application? Does it bypass cooler return water around the heat exchanger?

[caper]

thanks Scott, i thought so, i gues i should get some mixing valves eh...dont wanna risk hurting the in floor heating...

[Scott7m]

It can hurt hardwoods and tile too, it's just not a good idea to go without it

[yoderheating]

I always mount the mixing valve on the pump so the pump is pulling in mixed water.