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Recirculation system question/idea
While I was originally going to pipe my new project in copper -- the long delay combined with seeing a few PEX plumbing systems has changed my mind. Think the "home run" Viega system may be the way to go. I'm wondering if anyone has real world experience with max distance and hot water wait time.
The preferred location for both boiler and indirect puts them under the kitchen next to a full bath -- so nothing is very far away there. Simple Grohe thermo valve and head. No body sprays or bathtub in the house. The second bath is about 18' away so the shower valve will be some feet more pipe wise and the sink a few more still -- let's say 25 feet. I'm going to insist the pipe is insulated .... but I'm wondering if I should figure out some recirculation solution?
I could do another two place manifold in the bathroom or I guess simply run a single 3/4 PEX to the bath and split to the sink and the shower and do a typical dedicated 1/2 PEX return loop.
On my other systems I always use a Laing pump with internal thermostat -- separate time controller. Some people now use a an occupancy sensor --
There is a chance that my mechanical room may not be big enough for everything -- causing the DHW tank to move about 15' from the boiler. This only changes the distance to that same distant bathroom -- now much further. If I have to do that I don't think any question it needs recirculation -- over 40'
I'm surprised how little information is available for new system w/ dedicated lines .. and nothing about "home run" systems. It's all retrofit systems with the mixer using the cold .... don't want that.