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Thanks Bripel, pipe (Polypipe) is in screed already. Need manifolds etc. Will try U/F direct, just found website from your tip. DF

Thanks Registered Gas Man. I have left an access hatch where all the pipes and sleeves gather. This will finally be under the false floor of a drying cupboard. I will find the smelling salts and price up the NU Heat system. What about competitor systems? Any suggestions anyone...

Hi Chrishutt, Access provision noted. So going back to first principles, wherever hot or tank water could siphon back into cold main via defective sealing washer??? :idea: Presume kitchen sink mixer tap, dishwasher, washing machine , outside taps also. Thanks DF

Hi Chrishutt. Yep, Toolstation is correct. I have Work on the brain. sorry 'bout that. :oops: Thanks Kevplumb. So an actuator= a zone valve and the blending valve means I can walk across the floor without asbestos boots. :idea: Any takers on whether I can simplify design and assemble...

OK I give up. Where do check valves/double check valves go? They are as cheap as chips so better to fit now rather than rip the wall apart later! D :cry:

Can some kind soul give me (a link to) an intelligible :?: explanation of how UFCH controls etc work and what they comprise of in a multi-zone system? Also, is it possible, wise and economic to assemble a simple but effective set of the controls etc from components. 'Workstation' a Screwfix...

Where do i fit a Comap DBV when using a neutralizer? Neutralizer combines output from oil Camray boiler with Stanley brange cooker? :? many thanks