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Plumbing

New mega flow heating system being installed but found 15mm input.. expansion tank suggested.

Anonymous user 28/02/2024 - 3.12 PM

I have paid for a new megaflow system to be installed in a renovation but the plumber has just found we only have a 15mm input which I'm being told will not work with the megaflow system. I have been told I have 2 options:- a) Dig up our driveway to the mains and then replace with a 22mm pipe. ** This is too expensive so avoiding this option if I can. b) Add an expansion tank. My first question is whether the expansion tank will give the same effect as a 22mm pipe would directly to the megaflow? Additionally, what roughly would you expect the extra cost of adding an expansion tank to be as the quote I have been give seems astronomical. From what I understand of the job... it seems to be a little extra piping, an expansion tank and a day and half of labour? It could be correct but I have no idea? (This is a four bed house around 2500sqft).

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2 Answers

PAUL CATON GAS & OIL SERVICES LTD

Rating: 5 out of 5

Chesterfield

need 20litres a min for a megaflow,the 15mm may do 20litre has it been checked with a flow cup????

Answered11 March 2015

Otis Flame Ltd

Rating: 5 out of 5

Aberdeen

hi 15mm pipe inlet is not the problem and 22mm pipe is not the answer. All you need to the correct pressure inlet. Its possible to have 4 bar pressure inlet on 15mm which would be reduced anyway by Pressure Reducing Valve to 3 bar and 1 bar pressure on 22mm which may not work. So the answer is first check the pressure/flow rate first.

Answered12 March 2015