Many customers describe fast, professional installation visits with clear, polite engineers. Reviews often mention easy online booking and competitive prices. Fewer reviews point to long waits for follow-up visits and leaks that were not fixed after the work. Aftercare and booking annual servicing come up most often as the ongoing concern.
Examples from available reviews (Nov 2021 – Feb 2026).
Fantastic deal and smooth, professional service with excellent aftercare.
“Got a fantastic deal on Warmizlla for my Viessmann setup”
Fast installation, quick responses, and perfect, hassle-free service.
“Absolutely brilliant service from start to finish!”
Long delays for boiler service led to leak and ongoing unresolved repair.
“Took nearly 7 weeks before I could get my boiler serviced.”
Reviewer reports terrible service and no aftercare.
“Terrible service 0 after care avoid avoid avoid”
Installation feedback often mentions on-time teams, tidy work, and engineers fixing issues on site, such as flue routing or faulty parts. Several reviews describe a quick move from quote to installation and praise specific engineers. A smaller group focuses on the difficulty of booking follow-up visits and delays with annual servicing.
Many reviewers point to competitive prices, clear quotes, and good value for boiler replacements or upgrades. Some mention finance options and say there were no surprise charges. Value comes up often, though it does not dominate the dataset.
Customers often describe a smooth process, with clear explanations, tidy installs, and quick completion. Several accounts praise the online form and booking journey for being simple and for securing dates quickly. A smaller number report frustration when later service visits took a long time to arrange.
Comments on products and workmanship are mostly positive, with mentions of reliable EV chargers, well-fitted boilers, and engineers who clean and calibrate equipment. Reviewers often describe long-lasting installations and helpful setup walk-throughs. Reports of product problems are limited compared with service complaints.
Many reviews highlight timely updates, clear post-install paperwork, and polite, informative engineers. Customers often say staff kept them updated at each step and responded quickly. Communication issues are not common, but they appear alongside aftercare concerns.
Reviews split between many highly satisfied customers praising installation, value, and communication, and a smaller set of low ratings tied to delayed follow-ups and leaks that stayed unresolved. Positive reviews often recommend the company and mention repeat purchases. Negative reviews focus more on post-install service delays than on the initial installation quality.
For each review, the core experience based on original source reviews.
Sources: Trustpilot (40) · Reviews (19) · Reviews (1) · Quotes shortened · As of: February 2026
Fantastic deal and smooth, professional service with excellent aftercare.
“Got a fantastic deal on Warmizlla for my Viessmann setup”
Fitting was good but annual servicing contract was difficult to arrange.
“trying to get them to sort out my annual service is a nightmare.”
Good experience with timely completion of the work.
“Good experince , and timely finish the work”
Amazing experience; reviewer highly recommends the service.
“Amazing experience recommended to anybody 10/10 experience!!!”
Reviewer gave five-star feedback and recommended the service.
“5* service highly recommend”
Amazing service and reviewer would definitely recommend.
“Amazing service would definitely recommend”
Reviewer reports best boiler experience they've had.
“The best boiler experience I’ve had x”
Brilliant service; reviewer could not ask for anyone better.
“Brilliant service couldn't ask for anyone better 10/10 recommendation!!!”
Fast installation, quick responses, and perfect, hassle-free service.
“Absolutely brilliant service from start to finish!”
Reviewer very pleased and describes service as very professional.
“well pleased..........very professional..........”
Engineer cleaned grit, explained manual settings, improving control.
“The engineer cleaned out the grit from the compress unit”
Excellent communication and professional, problem-solving installation.
“Excellent communication from WarmZilla throughout the process.”
Engineer found a solution to a stockcock issue during installation.
“the engineer managed to find a solution, which was excellent.”
Boiler cover purchased but company failed to arrange follow-up visits.
“the comapny was unable to arrange anyone to come and see what the problem was.”
Initially wary, but installation team performed excellently compared to competitor.
“they and the installation team were excellent from start to finish.”
Gas safety check completed on time with no issues reported.
“Grace from Warmzikka came on time”
Installation on scheduled date and quick post-installation help received.
“Installation made on the date given by Warmzilla.”
Work completed well and considered great value.
“Work done well, great value”
Spot-on communication; prompt, quick job and helpful staff.
“Communication has been spot on”
Long delays for boiler service led to leak and ongoing unresolved repair.
“Took nearly 7 weeks before I could get my boiler serviced.”
Air conditioning installed neatly; team professional and system works well.
“the experience was excellent from start to finish.”
Amazing service and aftercare; reviewer plans another purchase.
“Absolutely amazing service and aftercare from these guys.”
Repeated delays and unresolved leaking after a routine service.
“boiler was left dripping and leaking.”
Excellent service for new gas boiler installation.
“Excellent service for our new gas boiler.”
Third boiler purchase with consistent support from the company.
“My 3rd boiler with these guys and still the same consistent support.”
Exceptional installation process with clear quotes and impressive aftercare.
“no nasty surprises with hidden costs.”
Reviewer reports terrible service and no aftercare.
“Terrible service 0 after care avoid avoid avoid”
Same engineer serviced boiler and gave it the all clear.
“give our boiler the all clear for another year.”
New boiler fitted smoothly with clear explanations and tidy installation.
“Installation engineer was 1st class”
Professional, punctual team explained setup and left area clean.
“The team was professional, punctual, and very knowledgeable.”
Warmzilla kept me informed and provided flexible, good value service.
“Warmzilla have been nothing short of amazing every step of the way”
Boiler ordered Saturday and fitted by Tuesday; very satisfied.
“Ordered Saturday pm and boiler fitted by Tuesday afternoon!”
Form was simple and installation scheduled within a day.
“Incredibly simple to fill the form”
Helped select and upgrade an old boiler to a new model.
“Helped to upgrade 25 years old boiler to the latest one.”
Josh Day provided effective, empathetic customer service and resolution.
“Great customer service from Josh Day”
Stress-free process with clear communication and excellent installation.
“From start to finish the Warmzilla experience has been top class.”
Service was described as brilliant from start to finish.
“Brilliant from start to finish”
Warmzilla solved a difficult flue issue and fitted quickly.
“Warmzilla came up with a solution instantly”
Quick, friendly service and satisfied with product.
“Very quick and friendly.”
Kept informed at all stages; plumbers were polite and helpful.
“kept me informed at all stages”
This page combines submitted experiences with public reviews from platforms such as Google, Trustpilot, etc. Recurring points are summarised without changing the content of reviews.
WarmZilla is a UK heating and energy services company that installs and replaces home boilers and related heating equipment. It also installs EV chargers and carries out on-site safety checks and maintenance visits. Customers can get quotes and book installations online, with finance options available. WarmZilla uses trained field engineers and provides written safety and service paperwork after the job is finished.