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- 13 Feb 2024
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Yup.Presume its installed the right way round!,
Points the right way. System worked for 10+ years.
The system didn't have the LPG boiler when they commissioned the biomass boiler.It may be required to stop the LPG boiler (when on) pumping water into the top of the store
The main vent is the F&E in the house. There's a bottle valve on the heat store tank.and back through the biomass boiler and even though unlikely up through the biomass boiler vent, so have a good look before (if) removing it.
My guess is that it relies on the spring pressure to be strong enough to counter thermal/gravity cycling of the hot water between the heat store and house? The pumped pressure (should) easily open it.
But I'm not sure how much of a gravity effect there would be given that both the flow and return go underground below the level of the heat store?
I don't think it's that.if its a swing check valve then I would be inclined to just renew it as these have little or no head loss.
But it sounds interesting. I wonder if I should put one of those in instead?