What size and make of boiler ?

[MattT]

Hi all,

I have a 5-bed, 4-bath house (1 master, 3 en-suite) plus a downstairs WC. It’s 270 sqm with 19 radiators. When the boiler was first fitted the house was 210 sqm, but was extended about 3 years ago and we bought it 16 months ago.

The boiler is an 8-year-old Vaillant Ecofit Pure 630 (30 kW). It’s always struggled to get heat to the last two radiators on the circuit. Most rads don’t have TRVs, and I assumed fitting them might help by pushing flow to the end of the system and perhaps a system clean.

Recently the boiler has started making noise. I suspect it needs cleaning, flushing and inhibitor, though there may also be a mechanical issue.

Online guidance seems to suggest a suitable replacement is a Vaillant EcoTEC Plus 35 kW or Worcester Bosch 8000+. I know calculators aren’t perfect compared to a proper survey, but does it sound like I need a larger boiler, or is the current one likely correctly sized and just in need of proper maintenance?

Thanks

 

[Wayners]

Sounds like you need to get radiators balanced.
You also need water inside to be clean with inhibitor.
Find a good local heating company to come and advise.

Oh. You can get booster pumps

 

[MNW67]

It also probably depends on how well the house in insulated. When was it built.

 

[MattT]

It also probably depends on how well the house in insulated. When was it built.

1930 house, cavity wall and about 150mm of insulation in the loft from memory