Gravity feed hot water tank

[Kellyman]

I’m fitting a ‘gravity feed’ hot water tank in a mobile home that has restricted head height for a cold gravity feed header tank. I can install an expansion over flow to an outside drain. Is it possible to use a Pressure Reducing Valve to supply the cold water from the mains supply. Or is there any other way to supply the cold.

 

[EvilDrPorkChop]

You'd be better with an unvented cylinder or small hot water heater..... You'd need someone G3 qualified.

But short answer is no, you can't do what you're thinking.