JeffeVerde
Member
My sister's 7 year old house was plumbed w/ PEX and came with on-demand hot water -- but instead of spending the extra $30 worth of PEX to run a return loop, the builder used a crossover valve (which has failed). There's easy access to the lines in the attic, and we want to run a dedicated return -- no big deal --- except the place where she really wants the hot water on demand is at her kitchen sink, and it's at the end of about a 25' branch.
The kitchen sink is in an island (on a slab), so I can't run a loop to it - but there is an unneeded 3rd line from the island to the wall (to tie the ice-maker supply into an undersink filter system). I can use this as a return as denoted with the dashed lines, but I've got a feeling that if I just "T" it into the main return, it's either going to short-circuit the return for the far bathrooms, or be bypassed.
Am I right in thinking that a simple Tee won't work? If so, any suggestions? Maybe a passive crossover valve at the kitchen sink (from the hot supply to the return leg)? Check valves? Both?
The kitchen sink is in an island (on a slab), so I can't run a loop to it - but there is an unneeded 3rd line from the island to the wall (to tie the ice-maker supply into an undersink filter system). I can use this as a return as denoted with the dashed lines, but I've got a feeling that if I just "T" it into the main return, it's either going to short-circuit the return for the far bathrooms, or be bypassed.
Am I right in thinking that a simple Tee won't work? If so, any suggestions? Maybe a passive crossover valve at the kitchen sink (from the hot supply to the return leg)? Check valves? Both?
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