I tried this originally I installed a pump for I think £300. It was so noisy and it lasted 1 year before it broke. It now sits unplugged. RedundantJust bolt on a pump or power shower(s), easier all round.
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That’s fine. Appreciate being told the facts. Thinking now that I agree that flow rate and pressure is going to determine setup. Not just wacking I’m a big system without decent flow rate. I Just don’t understand why 2 separate plumbers came and recommended a combi. I guess finding a plumber who’s thorough and very competent is the next step. Any recommendations for one who works in Northampton please let me knowIf I go back to your first post, you believe that your incomming flow rate is around 15 litres per minute. Any Combi fitted should be sized to that flow rate. A 42kw Combi requires a much higher flow rate than that.
You have clearly set out what your requirements are - you need a decent heating engineer to design a system to deliver them and give you some guarantees.
A Combi solution (without an accumulator) winot address the fundamental issue that you have - low flow.
At the moment, with the route you are following, the likely outcome is that the showers won’t perform significantly better than they do now.
I would also talk to your neighbours as to how they have addressed and resolved this issue.
Apologies, but I have seen it so many times - systems ripped out, an enormous Combi on the kitchen wall - and the shower still trickles.
As the previous poster succinctly said - pumping the shower from a vented hot water tank will at least show some imorovement.
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That explains a lot. As a general member of society it didn’t enter my mind that the mains coming into my house ever varies and or wouldn’t be sufficient to run any size powershowers. Without thinking it through I just expected a limitless flow rate from the outside main pipe. I always thought that people stored water in cylinders primarily because the boiler was unable to produce enough hot water on demand. And not that the incoming cold supply may not be able to keep up.The other dynamic to consider is ...you install pump assistance to achieve desired rate from your combi then as you are legitimately taking your neighbours water they go and get
similar pumps installed and you are all back to square one. I watched a whole cul de sac in
Hightown go this way we did our fair share. Stored water is the best way it can build up overnight for the morning onslaught and recover during the day. Then in the summer you will be laughing when your neighbours cant even suck it out of the main
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