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- 21 Mar 2017
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Hi,
I'm hoping that someone can advise on this issue:
I've a vented, oil fired heating system with two separate circuits for HW and CH. At the moment there is simply a thermo syphon circuit for the HW and the temp is controlled by the boiler stat which results in extremely hot water when the CH is working.
I'd like to put a stat on the HW tank and control the flow through the circuit with a motorised valve once the required temp is achieved. But that raises the question of how best to plumb it in so that I don't dead head one or both of the circuits. The options I've been kicking about were:
1) Divert the flow from the HW circuit to the CH circuit, but the CH is pumped while the HW isn't.
2) Fit a pump to the HW circuit as well and divert the HW flow to the CH circuit, but presumably the flow is already filling the system, if I add the extra flow will I end up with both circuits performing badly as the CH circuit I guess was sized for the flow it already has.
3) Simply bypass the HW tank with a motorised valve and return the hot water to the boiler but I guess that would trip the boiler stat and shut it down.
Your advice would be welcome.
The rambler
I'm hoping that someone can advise on this issue:
I've a vented, oil fired heating system with two separate circuits for HW and CH. At the moment there is simply a thermo syphon circuit for the HW and the temp is controlled by the boiler stat which results in extremely hot water when the CH is working.
I'd like to put a stat on the HW tank and control the flow through the circuit with a motorised valve once the required temp is achieved. But that raises the question of how best to plumb it in so that I don't dead head one or both of the circuits. The options I've been kicking about were:
1) Divert the flow from the HW circuit to the CH circuit, but the CH is pumped while the HW isn't.
2) Fit a pump to the HW circuit as well and divert the HW flow to the CH circuit, but presumably the flow is already filling the system, if I add the extra flow will I end up with both circuits performing badly as the CH circuit I guess was sized for the flow it already has.
3) Simply bypass the HW tank with a motorised valve and return the hot water to the boiler but I guess that would trip the boiler stat and shut it down.
Your advice would be welcome.
The rambler