In the Trades
- Reaction score
I've not much experience with the pumps used for dumping hot into the cold tho I do have one specified for an upcoming project. But if feasible a dedicated return is just the best way to keep the hot side hot and the cold side cold. And if they're repiping anyways an additional tube run is minimal work.For an application like this, what are the pros and cons of a dedicated 24' long return line, vs a point of use pump that dumps the hot water back into the cold line?
Yes, just the same as that powder room that may never get used. Open heating systems are supposed to be setup to cycle 15 minutes at least once a day.. or something to prevent stagnation. So perhaps a control that cycles the pump periodically if a manual button were used. I still prefer the aquastat which is going to cycle the pump periodically and incedentally prevents stagnation.If the pump is manually activated, is there any concern about stale water in the recirc line if it doesn't recirculate for weeks or months for some reason?
I'm sure theres an energy cost / benefit.. but I only consider the convenience when selling and designing a recirculating system.How about pump location with a dedicated return line? If the pump is near the lav, and only runs until hot water reaches the pump, then I don't see any energy cost to the recirculation (other perhaps than foregoing washing your hands with cold water). The water going into the recirc line would otherwise have gone down the drain.
Something I've never tried, but it makes sense. But pumps are noisy so to keep from getting sued, I like them in a mechanical room.If the pump is at the water heater end of the recirc line, and runs until it sees hot water, then I think the standby losses of the 24' of hot water line to the full bath get doubled. Of course, this is more about pump controls location than actual pump location.
Yes, each branch could be 1/2 from the loop. Not sure how they're working the un-crawl area, but I'd feed that spot with 3/4 from the loop and half to the laundryLastly, how about pipe sizes in the diagram above? I can see supplying the kitchen sink with a separate 1/2" line from the tank, as it's so close. And the spur to the half-bath is 1/2". Is 1/2" adequate for the supply to the full bath, with an extension to the washer? Or a 3/4" supply to full bath and washer, with a 1/2" return line?
I believe its always a good idea to bounce ideas off other people. everyone adds their experience and expertise.Just thinking this through out loud.