iHeat vs Warmzilla: Boiler Installation Review
Update: April 2025
Although Warmzilla has its merits, iHeat* is our recommended new boiler installation provider in April 2025.
We found their fixed price, online quotation system very easy and quick to navigate through, and got the most competitive price out of all the providers we tested.
A good range of boilers were available to select from with warranty and after-care arranged and confirmed by iHeat*.
No hidden costs were added and a financing option to pay monthly was available to apply for, if required.
A next day installation slot was available and the communication was efficient.
To get a wider range of opinions, a high Trustpilot rating indicates most customers had a very positive installation experience. As of April 2025, iHeat are also a Which? Trusted Traders approved service.
Visit iHeat* for a no-obligation and instant online quote.
Comparing iHeat and Warmzilla Boilers
When selecting a new boiler for your home, two top brands to consider are iHeat and Warmzilla. Both offer efficient condensing combi boilers backed by solid warranties. Deciding between them depends largely on your priorities – upfront cost, long-term ownership costs, smart features, and reliability ratings.
Upfront Purchase Price
The purchase price for an iHeat or Warmzilla boiler can vary depending on specific model, size, and special offers. In general though, entry-level iHeat models tend to cost less upfront compared to similar Warmzilla boilers. However, Warmzilla boilers may have longer lifespans which impacts the total long-term cost comparison.
Installation and Servicing
When it comes to installation and servicing, both iHeat and Warmzilla boilers require professional fitting by a Gas Safe registered engineer for safety, efficiency ratings, and warranty validity. Installation complexity depends partly on whether you’re switching from a non-combi boiler. Most engineers offer competitive rates for first-time buyers of both brands.
Regarding servicing, annual inspections are recommended to keep your boiler running safely and efficiently, prevent breakdowns, and may be required by your warranty terms. Servicing pricing is similar across both brands if done by your original installer.
Running Costs and Energy Efficiency
In terms of running efficiency, most high-end iHeat and Warmzilla models hold SEDBUK A ratings for energy efficiency. However, Warmzilla edges out iHeat slightly on ErP operational ratings which account for smart controls. These can adjust boiler output based on home occupancy and usage to optimise gas consumption.
It’s difficult to generalise total lifecycle costs due to regional energy rates, usage levels, and product lifespans impacted by water minerality. Typically though, a new A-rated boiler yields 20-30% gas savings over an older boiler. In that aspect iHeat and Warmzilla are on par based on SEDBUK scores.