BOXT vs Renzy: boiler installation prices in London
Fitted prices for the same boilers, with warranties, installation dates and finance side by side.
Get my fixed priceKey takeaways
BOXT and Renzy both charge £2,549 to fit a Worcester Bosch Greenstar 4000 25kW in central London. Renzy is the same price on all 9 boilers both fit. Both give you a fixed price online without a home visit, and both can fit your new boiler the next working day. The biggest differences are how you pay and who fits it. BOXT offers finance, including 0% on selected boilers, and sends a local installer from its nationwide network. Renzy doesn't offer finance at the moment, takes no payment online, and only fits boilers in London.
BOXT and Renzy at a glance
| Compared | RenzyPlumbers |  |
|---|---|---|
| Fitted price, Worcester Bosch Greenstar 4000 25kW | £2,549 | £2,549 |
| Manufacturer warranty | 10 years | 10 years |
| Workmanship guarantee | 12 months | 12 months, after BOXT audits the job |
| Earliest installation | Next working day when you book before 3pm | Next working day when you order before 3pm |
| Saturday installation | £100 extra | £100 extra |
| Finance | Not offered at the moment | 12 to 120 months, with 0% on selected boilers for up to 48 months |
| Paying | Pay nothing now. We'll call to confirm your date, then take a 50% deposit to secure it. The rest is due when the job is done. | Pay in full by card when you order, or apply for finance |
| Who fits it | Renzy's local London team | A local installer from BOXT's network of 17,000+ accredited engineers |
| Where they work | London only | Nationwide |
| Reviews | 4.4 on Trustpilot | 4.7 on Trustpilot |
| Established | 2025 | 2012 |
BOXT's prices checked on 27 September 2026 for EC1A 1BB. Renzy's prices are from our current price book.
Same boiler, side by side
Every boiler both companies fit, priced for the same job: a combi swap in a central London flat, with the new boiler in the same place and a flue through the wall.
| Boiler | BOXT | Renzy | Renzy is |
|---|---|---|---|
| Ideal Logic 24kW | £1,995 | £1,995 | Same |
| Ideal Logic 30kW | £2,040 | £2,040 | Same |
| Worcester Bosch Greenstar 4000 25kW | £2,549 | £2,549 | Same |
| Worcester Bosch Greenstar 4000 30kW | £2,649 | £2,649 | Same |
| Ideal Logic Max 30kW | £2,659 | £2,659 | Same |
| Vaillant ecoFIT pure 825 | £2,769 | £2,769 | Same |
| Vaillant ecoFIT pure 830 | £2,800 | £2,800 | Same |
| Vaillant ecoTEC plus 832 | £3,290 | £3,290 | Same |
| Worcester Bosch Greenstar 8000+ 32kW | £3,650 | £3,650 | Same |
Prices include VAT and fitting. BOXT's are what its website showed for EC1A 1BB on 27 September 2026, after its automatic discounts and before promo codes.
The bottom line
BOXT, founded in 2012, sells boilers online at fixed prices. It fits them nationwide through a network of 17,000+ accredited local engineers, and has a 4.7-star Trustpilot rating from 64,444 reviews. You answer a few questions, choose from a range of fixed prices, and pay by card or on finance. Renzy works the same way for London homes: a fixed price online from a few questions, with no home visit. BOXT and Renzy both charge £2,549 to fit a Worcester Bosch Greenstar 4000 25kW in central London. Renzy is the same price on all 9 boilers both fit. Both packages include the same core work: removing your old boiler, a chemical flush, a magnetic filter, a programmable thermostat, a carbon monoxide alarm, a gas pipe upgrade where needed, and registering your warranty. Where they differ is paying and scale. BOXT lets you spread the cost and takes payment when you order. Renzy takes nothing online: we call to confirm your date, then take a 50% deposit, with the rest due when the job is done. BOXT also has far more reviews, built up over many more years, while Renzy is a newer London company with a 4.4-star rating from 11 reviews. If you want to pay monthly, or you live outside London, BOXT is the better fit. If you're in London and would rather pay nothing until you've spoken to someone, get your fixed price from Renzy and compare.
Disclaimer
We read BOXT's prices from its website for a sample central London postcode (EC1A 1BB) on 27 September 2026. Online boiler prices change often and depend on your home, so your price from either company may differ. Get a quote from both before you book.
Finance terms, installation dates, warranties and Trustpilot ratings come from each company's website and Trustpilot page, and may have changed since we checked them.
This comparison is not an endorsement or recommendation. We are not affiliated with BOXT, and everything here is based on publicly available information. Renzy accepts no liability for decisions made based on this comparison.
BOXT vs Renzy: FAQs
- Is Renzy cheaper than BOXT for a new boiler?
BOXT and Renzy both charge £2,549 to fit a Worcester Bosch Greenstar 4000 25kW in central London. Renzy is the same price on all 9 boilers both fit. Both prices include VAT and fitting, for a like-for-like swap with the boiler staying where it is. We last checked BOXT's prices on 27 September 2026.
- How quickly can BOXT and Renzy fit a new boiler?
BOXT can fit a boiler the next working day if you order before 3pm, and Renzy can if you book before 3pm, as long as an engineer is free. A Saturday installation costs £100 extra with BOXT and £100 with Renzy. Most combi swaps take one day.
- Can I get a new boiler on finance?
BOXT offers finance over 12 to 120 months, with 0% on selected boilers for up to 48 months. Renzy doesn't offer finance at the moment. With Renzy you pay nothing online: we call to confirm your date, then take a 50% deposit, and the rest is due when the job is done.
- What warranty comes with the boiler?
Both register the manufacturer's warranty for you, so the same boiler comes with the same warranty from either company: 10 years on a Worcester Bosch Greenstar 4000 25kW, for example. Both add a 12 month workmanship guarantee on the installation.
- Who fits the boiler?
BOXT sends a certified engineer from its network of 17,000+ accredited local installers, and audits every job before signing it off. Renzy is a London company and only fits boilers in London, with certified engineers.
- How do BOXT's reviews compare with Renzy's?
BOXT has a 4.7-star Trustpilot rating from 64,444 reviews, built up since 2012. Renzy is much newer and smaller, with a 4.4-star rating from 11 reviews. Reading recent reviews for both is the best way to judge them.