No wasted water, no wasted heating fuel[other than what is always wasted by water cooling in the pipes. When you turn the light off, the relay turns off and the process is reset. IOW,when you switch, the pump turns on, after 'x' seconds the DOM relay kicks, and since the pump is wired through the normally closed contacts, it turns the pump off, not on. If you add a DOM relay into the circuit with the pump wired through the NC contacts, you could have a system that runs for say 20 seconds when you switch on the shower light. Set up a recirculating pump, only it is switched by the shower light. I cannot see wasting heating energy constantly recirculating hot water, but if it is a problem, how about this idea: Also, all the other fixtures are on the way to the master bath, so if I am not first to use hot water, it isn't much of a wait. It turns out it doesn't really bug me, and since I have my own well, I do not stress out over the social cost of heavily processed water going down the drain. When I redid my current house I considered doing something, as there are about 40 feet of pipe between the hot water tank and the master shower. – timer cost and possible replacement costĪnyone have any experience with these systems? – when the valve is open it will be using electricity, though not much, – when the valve is open, hot water will be siphoned from the tank into the loop, which will increase the heating the water due to reheating. – no cost of running a pump (some sources say it’s about the same as the cost of heating the water for a standard WH. Here are pros and cons of thermosiphoning as I see them so far: I think I could set this up with a timed valve, so it did not “run” while sleeping (thus not wasting energy to reheat the water). My plumbing setup (water heater in basement and fixtures a floor or more above) seems perfect for this. In my google search for dedicated return loops I came across the idea of a thermosiphon loop as described here. laundry and powder room at on the other end of the house, so I was considering an on demand recirculating pump for that end. Self-contained mounting - 3 screw mounting posts give secure and easy installationĬhemical resistant - Impervious to diesel, petrol, toilet cleaning chemicals etc.My HP water heater is being placed immediately below the master bath and an adjoining bath in my new home. Silicone duckbill valve - Long life with no perishing or hardeningĬonstant internal diameter - No restriction to flow The duckbill one way valve is designed to seal even when particles are present in the fluid. The simple one way breather valve at the top of the vented loop allows air to enter the line when not in use, thereby preventing siphoning - and yet seals when water or waste passes through the loop. They can also be used in genset or small engine inlet cooling water systems. Vented loops are used predominantly in toilet to overboard applications, toilet inlet applications and holding tank to overboard applications. Vented Loops prevent water siphoning back into a vessel and thereby guard against accidental flooding and sinking. Designed and made in New Zealand, TruDesign Vented Loops are the superior composite siphon-break solution for marine applications.

Possible feedback loop sound siphon