Whilst I am still working out some of the more difficult questions:   Does anyone know if the claimed no leaking ‘paddle’ type valve is better than a shoe valve? Pictures taken from Danfoss literature: I am looking to utilise 3-port valves to control my heating/cooling system so it has to isolate the UFH from the TS when there is no heat call (constant circulation) and also isolate the TS from the ASHP when cooling. All literature on valves shows some le