Boiler stove buying guide
Updated: 22 October 2026
You are shortlisting a boiler stove, and the page in front of you offers one big kilowatt number and a price. Two jobs hide in that number: heat for the room the stove stands in, and heat for the water that runs to radiators or a cylinder. This boiler stove buying guide is the order of checks before you pay. The [boiler stove comparison](/hub/fireplaces-and-stoves/boiler-stove) ranks six amazon.co.uk listings captured on 19 October 2026, from £560.00 to £888.02. Products Compared read the listings. A qualifying purchase can earn us a commission at no extra cost to you.
You are shortlisting a boiler stove, and the page in front of you offers one big kilowatt number and a price.
You are shortlisting a boiler stove, and the page in front of you offers one big kilowatt number and a price. Two jobs hide in that number: heat for the room the stove stands in, and heat for the water that runs to radiators or a cylinder. This boiler stove buying guide is the order of checks before you pay. The boiler stove comparison ranks six amazon.co.uk listings captured on 19 October 2026, from £560.00 to £888.02. Products Compared read the listings. A qualifying purchase can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Water output | Room output | Boiler volume | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Prity Prity K1 CP W8 water-jacket stove | n/a | n/a | n/a | 4.5 | about £560 | View offer |
 Prity Prity FGW15 cooker, 5 kW and 15 kW | 15 kW | 5 kW | 15 litres | 7.4 | about £888.02 | View offer | |
| Best value |  Prity Prity S3 W17 back-boiler stove | 17 kW bullet | 5 kW bullet | 23 litres | 5.2 | about £801.53 | View offer |
On this page
Two outputs, not one total
Output to the room is the heat you feel beside the stove. Output to water is what an installer can put into radiators, a cylinder, or both. Arada's choosing guide treats those as separate figures and asks a heating engineer to confirm any rule of thumb. If a listing prints only one heat-output field, you do not yet know the split, and you should not invent it by halving the number.
In this set, only the Prity FGW15 states both figures in words: 5 kW nominal to the room and 15 kW nominal to the water, with a 15 litre boiler, at £888.02. The Prity S3 W17 bullet says 17 kW to the water jacket and 5 kW to the room, at £801.53, while the heat-output field says 5 kilowatts. The Prity K1 CP W8, at £560.00, says there is a water jacket and gives no kilowatt split. When a page prints two efficiency percentages, leave them as two. The FGW15 prints 80% and 76.4%. The S3 W17 prints 80% and 75.5%.
Smoke control and Ecodesign are different checks
Ask the council whether the address is in a smoke control area before you care about a badge. GOV.UK sets out the rule: in a smoke control area you burn an authorised fuel, or you use an appliance that is exempt for the fuel you burn. In England, chimney smoke can mean a penalty of up to £300, and buying unauthorised fuel for an appliance that is not exempt can mean a fine of up to £1,000. None of these six pages states a Defra exemption, so this set is not a smoke-control shortlist on the captured text.
Ecodesign is a different gate. HETAS puts boilers from 1 January 2020, and stoves with boilers and cookers from 1 January 2022. Ecodesign alone does not let you burn wood in a smoke control area. The Prity W15 is the only listing here that claims ECO design, beside BImSchV2. BImSchV is German law, not a UK exemption.
The shelf price is the appliance
The six prices on 19 October 2026 are £560.00, £799.00, £801.53, £830.00, £850.00 and £888.02. That is the amazon.co.uk set, not the cost of a working heating system. A flue is not listed in the box. A liner, a pump, a carbon monoxide alarm and the labour to notify the work are separate. logburnercost.co.uk publishes a 2026 estimate of £5,000 to £8,000 installed. That is a publisher's range, not a quote. Paying £888.02 does not buy an exemption the page never prints.
A short list before you pay
Confirm smoke control with the council, then the exact model on the Defra list or an authorised smokeless fuel. Write down room output and water output, and reject an unlabelled 15+5 kW or a second total that does not match. Ask whether the system is open vented, what the heat leak is, and whether a combi link is in the manual. Treat Ecodesign, CE and BImSchV as separate from Defra. If those answers are still vague, you are not ready to buy. What must be notified afterwards is boiler stove installation.
Common questions
What is the difference between output to the room and output to water?
Output to the room is the heat from the stove body into the space it stands in. Output to water is the heat the jacket or back boiler can send to radiators or a cylinder. A single heat-output field does not tell you the split. In this set only the Prity FGW15 states both in words, 5 kW and 15 kW.
Is Ecodesign enough for a smoke control area?
No. HETAS and Defra treat Ecodesign and a Defra exemption as different checks. A smoke control area still needs an exempt appliance for the fuel you burn, or an authorised fuel. The Prity W15 claims ECO design on a bullet and does not claim a Defra exemption. German BImSchV on the same bullet is not the UK list.
Does the Amazon price include the flue and plumbing?
No. On these six listings the shelf price is the appliance. Reviewers of the Prity FGW15 say the flue pipe is extra. Plumbing, a liner, a pump and a carbon monoxide alarm are outside the £560.00 to £888.02 band. A publisher estimate of £5,000 to £8,000 installed is a different figure, and it is not a quote.
What if the title says 15+5 kW but another field says 20 kW?
Treat the page as unfinished. The Prity W15 does this: the title says 15+5 kW and the heat-output field says 20 kilowatts, with no sentence that says which number is the room. Do not add 15 and 5 and call 20 kW the water output. If those still disagree, do not size a radiator circuit from the listing.
When should I stop and ask an installer before I order?
Stop when you cannot name the water kilowatts, when the house has a combi or a sealed system, or when you would light the stove before the water is connected. Also stop if the address is in a smoke control area and the model is not on the Defra list. The person who will notify the work should see the manual before the order is placed.
Related pages
Sources
Public UK sources used for this comparison. amazon.co.uk prices, stars and review counts were taken from the listings on 19 October 2026.
- GOV.UK, Smoke control areas: the rules (retrieved 19 October 2026)
- Approved Document J (retrieved 19 October 2026)
- HETAS consumer FAQs (retrieved 19 October 2026)
- HSE, solid fuel back boiler alert (retrieved 19 October 2026)
- Regulation (EU) 2015/1185 Annex II (retrieved 19 October 2026)
- Defra Burn Better (retrieved 19 October 2026)
- Arada, choosing a boiler stove (retrieved 19 October 2026)
- Defra, cooker with boiler exempt list (retrieved 19 October 2026)