Customer rep that i chatted with was helpful in getting a competitive price and arranging a lot quick. any changes, i was informed on time and in one occasion, i was compensated for the delay. All thr... See more
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Really pleased overall with WarmZilla and would probably give 4.5 stars if Trustpilot allowed it. The boiler installation itself was excellent value for money and the engineers were professiona... See more
Company replied
Our boiler was fitted on the second attempt after the first fitter broke down on route. The men were prompt and efficient fitting the new boiler and left the place tidy. Unfortunately as yet the boil... See more
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Super quick. Kept informed. The engineer (Marcos) was outstanding in every way. Professional, polite, helpful, patient and highly skilled. Incredible how much he achieved in less than 2 days and le... See more
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Company details
- Boiler Supplier
- also in
- Boiler and Heating Service
- Electric Vehicle Charging Station
- Gas Engineer
- Gas Installation Service
- Gasfitter
About WarmZilla
Written by the company
WarmZilla is an online home services provider transforming how the UK buys and installs new boilers, EV chargers, air conditioning, and home heating solutions. Founded by experienced Gas Safe engineers, WarmZilla was built to eliminate pushy salespeople, hidden fees, and lengthy home visits by taking the entire quote and ordering process online. Using our quick online survey, customers receive fixed-price, tailored quotes in minutes. You simply choose the ideal boiler from leading brands - such as Worcester Bosch, Ideal, Vaillant, and Baxi - pick your preferred installation date, and let our team handle the rest. Every installation is carried out by handpicked, local Gas Safe registered engineers ("WarmInstallers") who deliver exceptional workmanship, complete system cleanses, and a clean, hassle-free setup.
We back all our work with a 1-year workmanship guarantee, top manufacturer warranties up to 10 years, and a price match promise. To make home upgrades accessible to everyone, we offer flexible payment options, including 0% interest-free finance. Beyond boiler installations, WarmZilla provides comprehensive home cover plans, annual servicing, emergency repairs, and EV charger installations across England, Scotland, and Wales.
Whether you need a quick boiler replacement or routine home care, WarmZilla delivers speed, transparent pricing, and 24/7 customer support - making home services simpler, fairer, and completely stress-free.
Best Price Guarantee
We won't be beaten on price
If you find a cheaper price on a like-for-like installation elsewhere, we guarantee to beat the price and take an extra £50 off your order.
Contact info
Capital Tower, Greyfriars Road, CF10 3AG, Cardiff, United Kingdom
- 02921 684 152
- ask@warmzilla.co.uk
- warmzilla.co.uk
4.3
Excellent
2K reviews
Asks customers to review
This company invites their customers to review, whether positive or negative
Replied to 72% of negative reviews
Typically replies within 2 weeks
How this company uses Trustpilot
See how their reviews and ratings are sourced, scored, and moderated.
Fitter did an excellent job,very clean…
Fitter did an excellent job,very clean tidy in is work,I would recommend Aziz to anyone,once again, thanks.
June 3, 2026
Reply from WarmZilla
Hi Janet,
Thank you for your wonderful feedback. We’re delighted to hear that Aziz did an excellent job and that you were pleased with the cleanliness and tidiness of his work.
Your recommendation means a great deal to us, and we’ll be sure to pass your kind comments on to Aziz.
Thank you for choosing our services, and we look forward to assisting you again in the future.
Marcos the plumber is a nice guy and…
Marcos the plumber is a nice guy and kept us informed. Tidy finish.
June 1, 2026
Unprompted review
Reply from WarmZilla
Hi,
Thank you for taking the time to leave us a review.
We're pleased to hear that Marcos kept you well informed throughout the job and delivered a tidy finish. We take great pride in providing excellent customer service and high-quality workmanship, so it's wonderful to know your experience reflected this.
We'll be sure to pass your kind comments on to Marcos. Thank you for choosing us, and we look forward to helping you again in the future.
Generally an excellent service
Generally an excellent service. I had been let down by other companies for reasons connected to flue installation and meter pipework. Warmzilla agreed to deal with these issues within their quotation. Installation of my new boiler was done within a few days of my accepting the quote. Two criticisms: Delivery of the new boiler, done on the day of installation, was delayed because the courier's van broke down. This meant installation did not complete until 2000. It might be better if boiler delivery took place before the installation day although I accept this may cause inconvenience to the customer. Also, the boiler registration process was not made clear. Apart from these points I am very happy with Warmzilla's service.
May 31, 2026
Reply from WarmZilla
Hi Neil,
Thank you for taking the time to leave such a detailed review. We're delighted to hear that we were able to help where other companies had been unable to, and that your new boiler was installed within a few days of accepting the quotation.
We also appreciate your constructive feedback. Unfortunately, the courier's vehicle breakdown on the day of delivery was outside of our control, but we understand the impact this had on the installation finishing later than expected. Your suggestion regarding earlier boiler delivery is valuable, and we'll take it into consideration as we continue to improve our service.
We're also sorry that the boiler registration process was not communicated as clearly as it could have been. While information regarding the registration timeframe was provided at the point of purchase, we appreciate that this may not have been as clear as it should have been, and we'll review how we communicate this process going forward.
Thank you again for choosing Warmzilla. We're pleased that, despite these issues, you are happy with the service you received and we wish you many years of reliable heating from your new boiler.
Kind regards,
The Warmzilla Team
Despicable company
Despicable company. I would leve zero stars if that was an option. I had a boiler fitted recently,I messaged the fitter the morning after installation to tell him there was water coming through my ceiling and he did not message back, he had left a radiator leaking that has damaged my floor and ceiling. He also left a magnetic filter leaking. They also stood on my kitchen worktop instead of using step ladders and have caused damage to that. Warmzilla and their fitter have not been back to have a look, inspect the work or put things right. They asked for photos which I sent and just accepted zero responsibility. They said my kitchen worktop was fitted incorrectly, it has been in there for over 10 years and regardless of how it is fitted a tradesman should be using step ladders not a kitchen worktop. That is a health and safety issue! The boiler has been having pressure issues since it has been fitted, I will be taking this further with legal action DO NOT USE THIS COMPANY!
May 6, 2026
Unprompted review
Reply from WarmZilla
Hi,
Thank you for taking the time to leave your feedback.
We can see that a member of our team has already been in contact with you and that an engineer has attended the property to investigate the issues raised. We are continuing to review the findings from the visit and the details of your case to ensure everything is properly assessed.
We appreciate your patience while this is being looked into and will continue to work with you towards a resolution.
I am absolutely delighted with my new…
I am absolutely delighted with my new boiler .
The two boys that came to do the installation were pleasant and helpful and explained everything to me .
They are a credit to their company .
May 28, 2026
Reply from WarmZilla
Hi Alexis,
Thank you for your wonderful review. We're absolutely delighted to hear that you're so pleased with your new boiler.
It's great to know that our installation team provided a positive experience and took the time to explain everything clearly. We take great pride in our engineers, and we're sure they'll be delighted to hear your kind words.
Thank you for choosing WarmZilla. We hope you enjoy many years of reliable heating from your new boiler.
Reply from WarmZilla
Thank you for your great feedback on WarmZilla. We’re really pleased to hear you were happy with the prompt installation and professional service provided.
We truly appreciate your support and thank you for choosing WarmZilla.
Great price, good communication
Great price, great customer service, thorough and friendly installer. Exactly how it should be
May 26, 2026
Reply from WarmZilla
Thank you for the fantastic review! We’re delighted to hear you were happy with the price, communication, and customer service from WarmZilla.
It’s great to know the installer was thorough and friendly too — exactly the experience we aim to deliver for every customer. Thanks again for choosing WarmZilla and for taking the time to share your feedback.
After months of stress and repeated…
After months of stress and repeated chasing, WarmZilla have finally rectified the flue installation issue with my boiler after concerns were raised about whether it had originally been installed correctly.
While I appreciate that the issue has now been resolved, the overall experience has been extremely frustrating and time consuming.
Communication throughout the process was poor, and I had to repeatedly follow things up myself.
I also paid an additional £150 on the day of installation for electrical work relating to a fused spur, yet I still have not received the Minor Electrical Installation Works Certificate despite requesting it multiple times.
The installation issues, delays and lack of documentation caused unnecessary worry and inconvenience. Credit where it’s due that the flue issue has now been corrected, but the aftercare and handling of the complaint have fallen well below what I expected.
May 26, 2026
Unprompted review
Reply from WarmZilla
Thank you for taking the time to leave your feedback. Whilst we disagree with some parts of the review as we do not believe all aspects are fully accurate, we do accept that there were issues during the process that could have been handled better.
We appreciate you acknowledging that the flue issue has now been resolved, and we’re sorry the experience caused frustration along the way. Feedback, both positive and negative, is important to us as we continue improving our service at WarmZilla.
Take care, and please remember we’re always here to support you if you need us in the future.
Filled form, chat with Agent - No Quote Time Wasted
Filled form no results and then also discussed with chat REPRESENTATIVE but they unable to send a quote...simply wastage of time... customer need delivery....
May 25, 2026
Unprompted review
Reply from WarmZilla
Thank you for your feedback. We’re really sorry to hear that your experience didn’t meet expectations, especially after taking the time to complete the form and speak with our team.
Unfortunately, in some cases we’re unable to provide an instant quote if the information provided doesn’t meet the criteria required for an accurate or safe estimate. That said, we completely understand your frustration and appreciate that your time is valuable.
At WarmZilla we’re constantly working to improve both our systems and communication to make the process smoother for customers. Thank you again for your honest feedback.
Reply from WarmZilla
Thank you for your great review of WarmZilla. We’re delighted to hear you found the boiler service simple and straightforward, exactly how it should be!
Excellent communication is something we work hard on, so it’s fantastic to hear that reflected in your experience. Thanks again for choosing WarmZilla — we really appreciate your support.
Great person
Great person, very knowledgeable. He has found a fault with the boiler that wasn't dealt with on the last repair done. Now I know I will log another warranty with warmzilla with the humming the boiler does and the f2 fault.
May 23, 2026
Reply from WarmZilla
Thank you for your review and for your continued trust in WarmZilla. We’re really pleased to hear our engineer was knowledgeable and able to identify an issue that had previously been missed.
We understand how frustrating ongoing boiler faults can be, so it’s great that the cause has now been identified.
Thanks again for your feedback — it’s greatly appreciated.
Really pleased overall with WarmZilla…
Really pleased overall with WarmZilla and would probably give 4.5 stars if Trustpilot allowed it.
The boiler installation itself was excellent value for money and the engineers were professional and knowledgeable. They also resolved a fairly significant issue for me in the end, which I appreciated.
The only reason I’ve knocked half a star off is communication. During the first visit/issue I felt a bit left in the dark and wasn’t kept updated properly, which was frustrating at the time.
That said, once things got moving again they were very good and the final outcome was genuinely strong. I’d still recommend them overall.
May 14, 2026
Reply from WarmZilla
Thank you for taking the time to leave such a detailed and balanced review for WarmZilla. We’re really pleased to hear you were happy with the installation, value for money, and professionalism of the engineers, especially that we were able to resolve the issue for you in the end.
We also genuinely appreciate the honest feedback regarding communication. Keeping customers updated throughout every stage is something we continually work on, and we understand how frustrating it can feel when communication falls short during important moments. Your comments are valuable and will help us improve the experience moving forward.
Thank you again for your recommendation and for choosing WarmZilla — it really does mean a lot to us.
Great price and quick installation
Great price and quick installation, guys on the phone were ace! The installation was done by Scott and his work is beyond excellent, like artwork is his pipework! We are delighted with the whole experience, thankyou for making our nightmare as easy as possible!
May 22, 2026
Unprompted review
Reply from WarmZilla
Thank you so much for the amazing review! We’re delighted to hear you were happy with both the price and speed of installation. We’ll be sure to pass your kind words onto Scott — he’ll love hearing that his pipework was described as artwork!
At WarmZilla we know how stressful boiler problems can be, so it means a lot to hear we helped make the process easier for you. Thanks again for choosing us and for taking the time to leave such fantastic feedback.
Great price and everything included
Great price and everything included. Brand new Shiney boiler working away keeping our home toasty and water hot. David our engineer was top bloke, did a fantastic job, highly recommend his work.
May 21, 2026
Reply from WarmZilla
Thank you for the brilliant feedback! We’re delighted to hear you’re happy with the price, the service, and your new boiler keeping the house warm and water hot 🔥
A big thank you as well for the kind words about David — we’ll be sure to pass this on to him. We’re proud to have top engineers like him representing WarmZilla. Thanks again for the recommendation!
Seamless from booking to installation.
Very easy and responsive communication from the start and an excellent boiler installation.
May 21, 2026
Reply from WarmZilla
Thank you so much for the great feedback! We’re really pleased to hear you found the communication easy and responsive throughout, and that you’re happy with your new boiler installation.
From all of us at WarmZilla, thank you for choosing us!
Fantastic price & service
Fantastic price & service. Our boiler developed a water leak and we decided it was time to retire it as it was 23 year old. I went straight online and found warmzilla. Was really happy with the price so made my purchase. The engineer Gary turned up exactly when they said he would and done a fantastic job. Couldn’t be happier. Well done warmzilla
May 21, 2026
Reply from WarmZilla
Hi,
Thank you for your fantastic review!
We’re really pleased to hear you found us online and were happy with both the price and the service provided.
After 23 years, it definitely sounds like your old boiler had earned its retirement! We’re delighted Gary was able to get everything sorted for you and that the installation went smoothly. We’ll be sure to pass on your kind words to him, he’ll really appreciate it.
Thank you again for choosing WarmZilla and for taking the time to share your experience.
Richard the Engineer turned up in…
Richard the Engineer turned up in perfect time, an apsolute Gent and did a great job much quicker than I thought. New system boiler in place of an old regular boiler. Everything great..
May 20, 2026
Reply from WarmZilla
Hi Thomas,
Thank you for your fantastic review.
We’re really pleased to hear Richard arrived right on time and did such a great job replacing your old regular boiler with the new system boiler.
We’ll be sure to pass on your kind words to Richard. It’s great to know the work was completed quicker than expected and that everything went smoothly.
Thank you again for choosing WarmZilla and for taking the time to share your experience.
Efficient and tidy fitters.
Our boiler was fitted on the second attempt after the first fitter broke down on route. The men were prompt and efficient fitting the new boiler and left the place tidy. Unfortunately as yet the boiler doesn't seem to be running as often as we'd like and I've yet to understand it. I have worked out how to put it on for a few hours which helps but more research is needed. I've looked at the hub but not found information yet.
May 12, 2026
Reply from WarmZilla
Hi,
Thank you for your review.
We’re sorry for the delay caused by the initial breakdown, but we’re pleased to hear our engineers arrived promptly on the second visit and carried out the installation efficiently and tidily.
We understand it can take a little time to get familiar with a new boiler and heating controls. It’s good to hear you’ve already found a temporary solution, but we’d be more than happy to help you get everything set up properly so the system runs exactly as you’d like.
Please feel free to contact our team and we can talk you through the settings.
Thank you again for your feedback and for choosing us.
Yearly boiler service
Yearly boiler service was carried out smoothly with excellent communication. The engineer showed up on time and was very respectful and well mannered.
I will be using this service again.
Thanks.
February 1, 2026
Reply from WarmZilla
Hi,
Thank you for your kind review.
We’re delighted to hear your annual boiler service went smoothly and that you were happy with the communication throughout. It’s great to know our engineer arrived on time and provided a respectful and professional service.
We really appreciate your support and look forward to helping you again in the future. Thanks again!
Good service
May 8, 2026
Reply from WarmZilla
Hi,
Thank you for your review!
We’re pleased to hear you received good service and appreciate you taking the time to share your feedback.
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