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Constant circulation system, anyone tried?
Ignore MC, maybe he'll grow up or go away.
SOme things you need to be cognizant of. THere is no communication between the thermostats and the pump, so you must incorporate a pressure activated bypass in the distribution piping circuit to avoid dead heading any pumps.
The final product will be extremely comfortable and as efficient as possible. This system goes against the typical AMerican way of Bang Bang control logic, but once you've started using them, they become easier to install then the typical American system.
Oventrop makes a 10 meter cap tube (33' in length) that can pretty much hit most exteriors, but if the length is a problem, you can always run the return line to wherever you need it to be to make contact with the control.
The system does require some education of the homeowner. The TRV's do not read in degrees F like the typical thermostat. It reads from 0 to 5. Each person has their own personal comfort setting depending upon the person as well as the setting. Generaly, once they find a good comfort zone, they leave the TRV's alone.
About the only disadvantage I can think of is the fact that you can't do a room by room programable set back. It has to be done system wide through the operating fluid temperatures.
Go for it, you will NOT regret it.
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