Pump sizing - hot water demand considered?

27 Jan 2009
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United Kingdom
Hi Guys
I have a detached 4 bed house with a total of 14 radiators running on 10mm pipe (from the boxing in I have removed in the house so far all the heating pipework is 10mm not just at the rads)

I also have an unvented megaflo cylinder for hot water demand running on 28mm pipework.

We normally heat the water at night when the heating is off.

The Wilo Gold RS50 pump is on the way out and I have the opportunity to have a new Grundfos Alpha 2L 15-60 for £94 (issue with supplier sending wrong product and offering discount to keep it)

I would guess that the RS50 is struggling slightly (despite my best balancing efforts)

So the question, would the slightly higher powered model be suited to both the heating and hot water situation which it needs to cope with?

To my novice eyes the proportional pressure setting of this pump would make it suitable?

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