Question regarding pipes sizing.

 

Central heating will be 35mm between ASHP and manifolds and 16mm Pex in the floor.

 

Water supply is submersible well. I was going to use 32mm MDPE into the house. System will be fed directly from pump no tank in attic.

What size pipes to the hot water cylinder (300l unvented).

Was going to use 16mm to kitchen.

 

There are 2 bathrooms 

1. Bath, shower, sink and toilet approx 4-5m from cylinder

2. Shower, sink and toiler appox 18m from cylinder

 

I want good flow and pressure but I don't want to be waiting for every to run off cold lines. Dont want a recirc system.

Would 16mm be enough to both bathrooms with a second separate 16mm connection to the bath?

 

 

 

Do you need 32mm mdpe, 25mm should be fine. You really need an accumulator between pump and house, otherwise your supply will feel rubbish. 100L should be fine, but bigger the better. Aren't you having filters? Min required would be a UV filter to kill bugs etc.

 

I have fed my whole house via a hot and cold manifold, all with 16mm. Once the pipe is in wet room, branched from there. For the 18m use a secondary returns circuit, with thermostat and timer or wait for about a minute h your choice.