How do I choose a boiler?

[DrSnoosnoo]

I'll keep it short.

We're buying house.

House is old has old 2 tank boiler set up for hot water and no Central Heating.

I want to remove these and replace with a combi boiler.

There are 1 thousand million combi boilers.

How do I choose the right one?

Property description:
3 Bed semi
1 Bathroom
will want (maybe) 7 rads and one of those towel rack/radiator things for the bathroom.

ta.
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[andyscooter]

buy a Worcester bosch one
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[Taught2BCauti...]

Go to B&Q and get them to calculate the size of boiler you need, then shop online for the BTU rating they give you.

My guess, because my house is about the same spec as yours, would be 80,000BTU.
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[Just_James]

boiler size calculator
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[arry]

You need to know the flow rate of your main supply too. No point buying a combi that can heat more water per minute than you're flowing otherwise you're just paying extra for something you can't use to its full effect

[panrider_uk]

Any rough idea of how much a plumber would charge to replace an existing boiler with a new one (me supplying the boiler)?

Just hanging it and modding the existing pipework so shouldn't be too expensive right?

Thanks
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Current bikes: Honda ST1100 Pan European. Moto Guzzi V85 TT Travel

[Ste]

[arry]

Including the boiler as long as you're not in a mansion - 1500 to 2000 quid fitted

[DrSnoosnoo]

Very helpful replies so far thanks. I'll use that calculator thingy but thinking about the water pressure, arry. How would I find out?

Quick calculator used despite not fully understanding it. It says 7.9 kW.

I'll have a look but does that number seem stupidly low/high, have I used the calculator really badly?
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I'm Sam; Northern, Ginger, Lover
Did have: '95 ZZR600 '83 CG125 '97 ZZR1100 '15 Hypermotard 821 SP Do Have: '10 ZX10R

[arry]

You use a flow meter. Effectively attaches to the nearest tap to the mains supply and then you run the tap at full flow - it measures the amount of water through and gives you the flow rate

[DrSnoosnoo]

[Wonko The Sane]

[DrSnoosnoo]

[Al]

[Jewlio Iglesias]

Why on earth would you put a crappy combi in?
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[stevo as b4]

I would think that a 3bed house of a fair size is getting close to the practical limits of having a combi boiler. There is no good reason to choose a combi in a large home IMO, and they also tend to have a shorter life span than other types of boiler.

But if you want a make to recommend, then just my personal preference would be a Valliant unit.

[Wonko The Sane]

[arry]

[Jewlio Iglesias]

[Raffles]

[arry]

[Wonko The Sane]

[Fowlersrs]

Here we go, vailant or Worcester will see u get a decent combi, Worcester do larger floor standing combis with a storage of water for larger properties. It all depends on how much hot water demand you have, are your showers electric or are they mixer units?

Don't let anyone put you off a combi, I've been in the trade 15 years and fit boilers daily for the largest supplier of LPG gas in the country. For 2/3 bedroom properties there is normally no more cost effective way of providing your heating/hot water

[grr666]

I deliberately bought bigger than I needed, but always planned to extend my house at some point in time.
I have a Bosch Worcester Greenstar 30CDI, it's installed in my loftspace as I don't have any suitable external
facing walls in my kitchen. It's a 30kW unit. Run via a wireless digital thermostat/timer/controller unit. Currently it's running my
hot water and 6 moderately sized radiators. At present I have just a single bathroom which has an electric shower so
is about 90% cold water used in there, the plan is to refit the bathroom and get rid of the electric shower,
but I'll only be able to do that after I have built the downstairs shower room giving us an alternative place to
get clean, wife goes to gym a lot so we can't manage without facilities for very long at all.

In a few weeks I intend to add a 7th rad in the lounge before winter arrives, There used to be a Baxi gas fire/back boiler
setup in there which was el crappo. There's now a small wood burning stove in the fireplace instead, but it's a bit of a faff
and it quickly gets too warm in there if you use it. For those evenings when it's just a bit chilly, a nice double rad
will take the chill off. When it's really cold I fire up both the stoves 1@ 14kW (kitchen) and 1@ 10kW (Lounge) and them plus the
central heating warms up the house like a motherfucker.

Got my boiler through a London based building contractor I used to work for, they get good prices on boilers
because they buy loads. Of course, they claim their VAT back so it actually cost me £877 all in including
horizontal flue and digital wireless timer unit.

Link is not where I bought mine from Just to demonstrate model/type.

https://www.directheatingsupplies.co.uk/worcester-greenstar-30cdi-system-boiler?gclid=CPeS0dr5jscCFRQatAodZ1sE1Q
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[panrider_uk]

The wireless thermostat/controllers are great.

I use one of these which can also be controlled over t'internet.

Clicky
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