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Posted: Wed Jul 07, 2010 9:20pm

Post Subject: fresh water pump + accumalator - is it needed ?

I am updateing my water supply, thinking of puting in 2 water pumps, 1 for hot and 1 for cold with a link inbetween; so if one fails one still has a water supply. Is an accumalator really required as I have survived for 4 years without one. Many thanks. tony Coombs. N/B- Mr MICAWBER. BASED ON THE RIVER AVON


Posted: Thu Jul 08, 2010 7:22am

Post Subject: fresh water pump + accumalator - is it needed ?

Dear Tony, Despite what many say an accumulator can not prevent the pump(s) cycling on and off as you draw water. What it will do is to extend the cycling frequency so in the right circumstances it appears to stop cycling. It will help make up for the pressure lost as the water in the calorifier cools overnight so you do not get woken by the pump running at about 03.00am. So if you are happy with the cycling and either do not mind the pump running at night or you turn it off overnight you do not need an accumulator. I would comment that two pumps connected as you describe (I assume with a valve which is normally closed) will make the cycling worse when using a shower and may cause temperature variations if you do nit have a thermostatic shower mixer or it is thermostatic but is slow to react to temperature. I think the hire fleets that tend to use two pumps pipe them in parallel and only switch one on at a time. Tony Brooks

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