Joined on January 19, 2011
Last Post on January 19, 2011
@ January 19, 2011 10:44 AM in thermostatic valve & pipe size with tanklessI have a new Rheem 64DVN tankless to heat DHW in a small Philadelphia rowhouse gut rehab. The heater will be in the basement, and supply the kitchen directly above, and the bathroom on the 2nd floor, directly above that.
When trying to buy shower valves, I learned that individual hot/cold are now out of code, and have read conflicting info about thermostatic valves with tankless.
Has anyone had problems with thermostatic valves shutting off the tankless due to low water flow when lukewarm water is demanded? (The valve I was looking at is Cifial 289.715.999 thermostatic with separate volume control.)
Are individual hot/cold controls recommended instead?
Also, has anyone had any problems meeting minimum flow from the tankless if 1/2" water supply piping (i.e. leaving the unit, up to the fixture) is used from a 3/4" manifold in the basement, up to the 2nd floor? (Is this bad in particular if the mixing valve has 3/4" connections?)
Many thanks. I'll pass on the good karma.