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Old 05-01-2013, 12:49 AM   #1
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D'Mand Hot water circ pump


Has anyone been able to economically figure out how to use a Metlund D'Mand hot water system and have pump shut-off thermistors at every fixture? It is my understanding that the thermistor at the pump is the only one the system is designed to use, but to my very crude electrical skills/knowledge it seems like the pump could "easily" be shut off from all fixtures in the circuit. It is a small issue that concerns me, but if the pump is the only shut-off point, then you will often circulate much more hot water than you need to. Thanks.

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Old 05-01-2013, 07:48 AM   #2
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D'Mand Hot water circ pump


No matter what kind of hot water circulating system you use and how you install it, the circulation has to be in effect a minute or two before you want to use the hot water. If you don't want the system running constantly then you would install individual (manual) switches at each location. (One switch per bathroom is sufficient.)

Also, if you don't want to "prime" all of the branches (bathrooms and kitchen) simultaneously each time you want to use hot water at any one location, you will need separate pumps, here, best installed at the respective locations instead of at the water heater.

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Last edited by AllanJ; 05-01-2013 at 08:28 AM.
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Old 05-01-2013, 01:44 PM   #3
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D'Mand Hot water circ pump


Al: OK. The D'Mand system has switches at all fixtures, but only the one thermistor to shut the pump off. I guess the only practical thing to do is to work w/ that system as is, and deal with a little bit of hot water in the line that you don't need. Most of the year that will contribute to heating the house, so it is not a huge issue. thanks for the reply.
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