Home DIY

Would the press. storage cyl and expansion tank fit into the same space as the immersion heater? The main idea of installing this setup would be to free up some cupboard space by negating the need for cold water tank along with having proper pressure from the bath/shower fitment (the flow almost stops when you get it head height).

Economy 7, yes.

I'd taken photos of the current setup to get a quote with but they must be on the old phone.

Guess it would help if I knew the capacity of the current one. Any idea what's suitable for a 1br flat?

The cylinder will be no bigger than what you probably already have. I guess a 150 litre will be ample if not a smaller 125 litre. The bigger the cylinder you can fit in, the more cheap rate hot water you will have stored to save heating water at the dearer daytime rate. The expansion vessel will just screw to the wall above the cylinder somewhere and is about the size of a bucket.

You will need an overflow pipe with a visible discharge outside. There is a thing called a tundish which goes beside the tank. This is in the pipe that feeds the overflow and allows you to see if any of the temperature / pressure relief valves have operated. There's also a pressure limiting valve to restrict the mains pressure to a safe level so a few extra bits of plumbing to fit in.

Also you will have to swap your cistern valve for a high pressure one and similarly the bath and basin taps.

None of this is based on anything other than experience - I'm not a plumber. #disclaimer