Gravity Fed to Pressurised Conversion

[middleman]

I am looking advice on this. I currently have a gravity fed hot water system installed and am looking to have this converted to pressurised before installing 2 new bathrooms. At present my mains water coming into the kitchen is 15mm copper.

Does all 15mm copper mains to the cylinder have to be replaced with 22 for this conversion or is it just the outlets to the rooms?

Thanks

 

[leakydave]

Refer to MI but usually they are fed in 22mm. Check the mains pressure and flow rate before you even consider changing anything. Without the right pressure the change could make very little difference.

 

[middleman]

Assuming the mains pressure and flow rate are ok. Is there anyway to use an accumulator to change from 15 to 22 in the attic rather than from the entry at the kitchen sink?

 

[picasso]

If the pressure and flow are ok (min 2 bar / 20 min) then the 15 mm pipes will be fine.

 

[middleman]

If the pressure and flow are ok (min 2 bar / 20 min) then the 15 mm pipes will be fine.

Will the flow not be lower even if the pressure is ok due to the 15mm though or am I right in saying that the 2 bar / 20 min is for 15mm with the usual 22mm pressure being lower but flow will then be the same?

 

[middleman]

If the pressure and flow are ok (min 2 bar / 20 min) then the 15 mm pipes will be fine.

Will the flow not be lower even if the pressure is ok due to the 15mm though or am I right in saying that the 2 bar / 20 min is for 15mm with the usual 22mm pressure being lower but flow will then be the same?

And am I right in saying a 300ltr unvented tank is what I'm looking for. It's a 4 bedroom house with 3 bathrooms and oil heating.

I won't be diy'ing this one by the way. Someone qualified will be doing it, just looking at options and trying to work out how much disruption there will be to other rooms.

 

[picasso]

Wait till you have the flow and pressure checked.

 

[middleman]

Wait till you have the flow and pressure checked.

I take it any qualified plumber should be able to test my mains pressure and flow rate?

 

[middleman]

Wait till you have the flow and pressure checked.

I take it any qualified plumber should be able to test my mains pressure and flow rate?

Answered flow rate and pressure are good enough.