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To achieve the necessary depth for underfloor heating & insulation we have to remove a 4 inch concrete slab and replace it.......sounds simple until you discover as we have that all internal walls of this late '60s house are built straight off the slab. Structural engineer describes this as...

Any tips gratefully received that might help to diagnose my Vaillant 835 ecomax DHW problem. Symptoms: Turn on hot tap, boiler fires up, get piping hot water at 60 degrees (as set by the DHW dial). 1. Boiler temp hits 75 degrees (Vaillant default) and boiler appears to scale back its...