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Well, I finally got round to changing the TMV. The mesh on the hot feed was almost completely blocked. So, fitted a Reliance solar tempering valve and a Protecto YC In Line Y Type Strainer ahead of it (to make maintenance easier), and job done. Nice hot water at 5 bar! My wife could not be...

Thanks for the tips. The pressure reducer is working fine.

I just discovered that the TMV connecting to the DHW outlet from the thermal store tank is a Caleffi 5213, which is a point-of-use valve! The plumbers should have installed a tempering valve, for whole house use - and probably a solar tempering valve at that, because the outlet temperature is...

The surging came every 2 seconds or less. In any case that's excellent advice about bypassing the TMV - that will tell me whether the flow out of the heat exchange coil is adequate or not. The way I see things, it's got to be either the TMV or coil. Thanks again. I'll let you know once I've had...

Thanks Newboy. Would a faulty TMV account for the surging I had noticed before? Would you recommend changing the TMV just to be sure? Thanks.

Hello. I wonder if anyone has a view on this problem of mine, which has been steadily getting worse: We have a waterjacketed woodburner that heats a 1,000L thermal store tank. We get mains hot water through a copper coil inserted in the thermal store, which heats the water. Over the last few...