Which? Trusted Traders
Installed from £1995

Glow Worm boilers

Glow Worm has been a pioneer in British domestic heating for nearly 90 years with the manufacturer having first produced boilers in Derbyshire in the mid-1930s.Today, Glow Worm boilers are installed and used in as many as 70% of homes.

Glow Worm Boiler
Glow Worm Logo

About Glow Worm

Glow Worm prides itself on being a pioneer in British domestic heating for nearly 90 years with the manufacturer having first produced boilers in Derbyshire in the mid-1930s.

Since then, Glow Worm has produced a wide range of boilers and continues to do so at their high-end manufacturing facilities located in Belper, Derbyshire.

Notably, Glow-worm was acquired by the second-largest heating company in Europe, the Vaillant Group, at the turn of the century.

How much do Glow Worm boilers cost?

For a standalone Glow Worm boiler, prices can range from £700 - £2,000 and are available in a wide range of sizes. However, it's worth bearing in mind that these prices don't include Gas-safe installation or any additional labour.

With a Gas-Safe installation, you'll be looking at £2,050 - £3,900. And, at Heatable, we can fit your Glow Worm boiler in as little as 24 hours.

Top features include

  • Compact, smart design to suit modern homes
  • 5 year out the box guarantee
  • Outstanding support & aftercare

Popular products

Vaillant ecoTEC Plus

Glow Worm Compact 24kW Combi Boiler

Designed and hand-made by the good folks at Vaillant, the Glowworm Compact is a wolf in sheep's clothing. It'll squeeze in to most small spaces (like kitchen cupboards), offers brilliant levels of efficiency, and boasts rock-solid reliability.

What's more, if anything was to go wrong with your compact during it's warranty, you'll be backed up and support by Vaillant's incredible aftercare.

  • 5 year part & labour warranty
  • Compact size means it fits in most cupboards
  • Owned by Vaillant Group

626mm (w) x 400mm (h) x 270mm (d)

Vaillant ecoTEC Plus

Glow-Worm Compact 30kW Combi Boiler

This version of the Glow-Worm energy range has an increased power output of 30kW, increasing the hot water flow rate by over 2ltr/min.

Consider the 30kW model for busier homes with higher hot water demands.

  • 5 year part & labour warranty
  • Compact size means it fits in most cupboards
  • Owned by Vaillant Group

626mm (w) x 400mm (h) x 270mm (d)

Speak to a Glow Worm specialist

By submitting your details you agree to our privacy policy

Replacement boilers,redefined.

All-inclusive boiler installations

New boiler

Installation

Controls¹

Pipework

Flush

Flue

Filter

Recycling

Aftercare

Which? Trusted Traders

We've been Which? Trusted boiler installers for 3 years running.

2023 • 2024 • 2025

Get a new boiler with up-to 4 years
Interest-free boiler installationsAPR²

Next day boiler installations

If ordered before 3pm

Heatable installer

Expert, local installers

We fit new boilers in every corner of the UK.

Fit boilers? Fit for us.

Which? Trusted installations

  • Which? approved installers
  • Fixed online prices
  • Next day installs
Which? Trusted Traders
Which? Trusted Traders. The first and only online boiler installation business to become a Which? Trusted Trader.
Heatable aftercare
All-inclusive aftercare. Each and every installation gets our exclusive 12 month workmanship warranty.
5 star reviews
5 star reviews. Across Trustpilot, Google and Reviews.io, we've got over 10,000 5 star reviews with an average rating of 4.9.
Gas safe registered
A safe choice. We're Gas Safe registered for boiler installations, and MCS certified for solar installations.

Boiler FAQs

This largely depends on the efficiency of your current boiler and how much energy you use. For example, you could save as much as £840 per year if you are upgrading from an old G-rated boiler to a modern A-rated boiler (along with a programmer, room thermostat and thermostatic radiator controls (TRV's)). For more details, check the Energy Savings Trust website.
The cost of a new boiler depends on a variety of factors, including the type of boiler you select, your location and the complexity of your installation.
On average installing a new boiler takes between 1 to 2 days to complete. If you are having your old boiler replaced in the same location and with the same type of boiler the process will be quicker (likely one day) compared to installing a different type of boiler in a new location.
Yes, you can. All of our installations have finance options available. You can spread the cost over 3, 5, 7 or 10 years at a rate of 11.9% APR. Or, you can spread the cost with 0% APR up-to 4 years on certain packages. Deposits are optional.
Yes, we can certainly try to. Heatable works with a panel of lenders, so, if for whatever reason you didn't pass with our primary lender, we will pass it over to a secondary who will be able to assist.
That's not a problem. If for whatever reason you change your mind, or need to cancel your install, you can do so without any fees. If you have paid any monies via card, we will refund this directly back to your account.
All of our installation partners go through a lengthy and strict Which? Trusted onboarding process. They're fully insured, highly rated and carry a unique set of skills to get your job, done. You'll receive details about your engineer prior to your install, including photo ID, so you know who to expect.

Yes, in more ways than one.

First, we're a Which? Trusted Traders which means we have to work to their strict standards and guidelines.

Secondly, we're Gas Safe Registered, and so are all of the installers who fit for us. We're also fully insured, giving you total peace of mind.

Services

Company

General

YouTubeLinkedInInstagram
YouTubeLinkedInInstagram

Services

Solar panelsBattery storageEV chargers

Company

Our storyContact usSitemapFAQ'sT&C's
Refer a friend

Get £250

General

InstallersReviewsPrivacy policyComplaintsModern slavery statement

© 2026 Heatable.

Heatable Ltd is registered in England and Wales No. 08804726. Our head office address is: The Old Rectory, Winwick, Warrington, WA2 8LE.

Heatable Ltd is authorised and regulated by the Financial Conduct Authority, FRN 805259 We are a credit broker and not a lender and offer credit from a panel of lenders. We may receive commission if your application is successful and the amount may vary depending on the product chosen and the amount of credit taken out. Credit is provided subject to affordability, age and status. Minimum spend applies. Not all products offered are regulated by the Financial Conduct Authority.

¹Wireless controls included on combi boiler installations only.

²4 years 0% APR available on selected products (subject to status and affordability).

³Saving based on the average energy bill of a detached home when upgrading from a G-rated boiler to an A-rated boiler. Source: Energy Saving Trust.

Gas Safe Registered
MCS Certified
RECC Certified
Trustmark Endorsed
NAPIT Certified
REFCOM Registered
Which? Trusted Traders