I am fitting a secondary circuit for an extension. I have a Greenstar 42CDi Combi boiler. I want to know if I need to fit a check valve on the return circuit as the new return circuit will run through a T junction with the existing return circuit. I have attached a diagram to hopefully make things clear.
I am worried that if the second circuit is on, but the first circuit is off there will be seepage back to the radiator which is above the pipe work so convection will help heat this rad.
Secondly, given the operating temperature, the distance of the return circuit will the flow / pressure be too weak to operate a check valve? Is there one on the market that will work?
Any advice, experiences would be very helpful!
Thanks
I am worried that if the second circuit is on, but the first circuit is off there will be seepage back to the radiator which is above the pipe work so convection will help heat this rad.
Secondly, given the operating temperature, the distance of the return circuit will the flow / pressure be too weak to operate a check valve? Is there one on the market that will work?
Any advice, experiences would be very helpful!
Thanks