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Thank you very much for all this insightful feedback. It seems my first step needs to be to find out why the ABV never closes - either a faulty ABV or debris inside.

Regarding the Tacosetter, I understand this is a fixed valve that sets the flow rate in the bypass, but with a visual display of the flow rate value. In effect I do have the same arrangement today with a fixed valve (but with no display) + ABV in series; so currently I am setting the fixed rate...

I don't know whether the bypass is only required when the boiler shuts down. Vaillant's installation manual specifies an ABV and does not mention a motorised valve to control the bypass. Also an ABV implies (to me) that the bypass is meant to respond variably as the TRVs close, although I...

Hi, regarding the pump mode, this has varied as follows. Background: My house is on 4 floors - the boiler/pump/MVs/DHW cylinder are in the basement, while the top floor rads are about 9m above. The UPS3 pump has Constant Speed 1-3, Proportional Pressure 1-2 and Constant Pressure 1-2. There have...

I have a similar question about the bypass valve location. My system comprises a new Vaillant heat-only boiler, pressure vessel, DHW cylinder, 3 Motorised Valves (1 x cylinder, 2 x CH zones) and 15 rads with 12 TRVs. Vaillant specify an Auto Bypass Valve (ABV) is fitted no less than 1.5m from...