New boiler advice please

Joined
7 Jan 2011
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Location
Durham
Country
United Kingdom
I have had a quote for a brand new central heating system, however Ive been quoted for two boilers;
VAILLANT ECO TECH PRO 28 KW and
VAILLANT ECO TECH PRO 31KW

I live in a 3 bedroomed semi-detached house with my wife and we only have one bathroom, just wondering if it was necessary to go for the 31KW

Any advice?
 
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the 831 has a longer warranty, slightly higher spec, reliability and performance are much the same though.
 
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depends on your cold water flow rate, pointless spending the extra on the bigger boiler if your cold water flow rate is only 10litres per minute.
If it was me id go for the 28kw ample for this size of house with one bathroom.
 
flow rate shouldnt even come into the decision, the difference is so minimal you wouldnt tell the difference.
 

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