pumped hot water and mains cold water to monobloc tap?

[anothergit]

Hi can anyone tell me is it ok to have a bathroom monoblock sink tap with the hot water fed from a pumped system and the cold water from the mains supply, or can this set up cause a problem??

Thanks in advance for your advice.

 

[Puddle]

Not a problem you however you should put a non return valve on the hot and a double check valve on the cold supply pipe work officially

imho