intergas combi 36/30 too big?

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15 Sep 2011
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Lincolnshire
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United Kingdom
my parents have been told there bungalow will need a 36/30 to replace a swiftflow 80. my parents don't heat the whole place up all the time and generally like it cooler. so im not sure if the plumber has looked at them and assumed big boiler for old people.

the bungalow was built in about 1996. double glazed. insulation slabs under the concrete floors. thermalite blocks in the outside walls. rockwool in the cavity. 100mm loft insulation, which there going to top up. trv's in the bedrooms.

the place is 14m x 10.5m.

overkill or just right?
 
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