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Think about additional controls - zoning, programmable thermostats, loft insulation etc etc as well as the boiler.

Hoval are top notch boilers - not cheap but the dogs danglies and knock spots off the other brands. Would be my choice.

UltraOil® (50-80) | Hoval

You get what you pay for.

Looking at the 16/35

now THAT looks like a premium bit of kit
 
Hoval are lovely bits of kit. Especially when they're matched with Riello burners.

I like their STU range of biomass too.
 
Have you fitted one of the STU biomass boilers? Got a biomass boiler to fit in a couple of months. Person who wants it is happy to pay a good price for a premium product.

We put a Hoval UltraOil in for a country inn and restaurant a couple of years ago and it can happily cope with the coldest of winter weather and provide water for the guest bathrooms, showers and the kitchens. You nearly always need a condensate pump as well due to the draw off level of the condensate.

The biggest boiler I have been involved in fitting was a Cochran Clansman, for a swimming pool, spa and leisure centre.
 
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I've got 6 of them I look after, Hoval come out and build them up, we just piped them up.

They're a bit labour intensive as there's no walking ash tray in them, so the end user needs to give them a declink every few days. ID fan belts last about 9-12 months.

The one thing I don't like about them is the arches. They typically last 3-5 years, cost about £80-100 per section and have 10 sections.
 
I'm guessing the house is some sort of estate house or the like

Do you have access to timber if so you could go for a gasification log boiler or wood chip

If you have a business address at property could maybe get it in commercial rhip
 
Go for Biomass, get capital paid back via the RHI, and save a fortune on oil (I'm biased though 🙂 )
 

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