Dimplex announced on 26 November 2025 that it has launched a newly updated Free Online Heating Calculator, a tool intended to help householders work out the heating output a room needs1. The company also said professional installers can access a separate Advanced Heating Calculator through its Dimplex PRO Installer Club1.
The free tool has been revised with what the manufacturer describes as a more user-friendly interface and clearer guidance1. Dimplex states that no login is required and that the calculator is accessible on its website, and it lists homeowners, landlords and DIY users as the intended audience1. The company says the calculator acts as a BTU calculator, with results given in kW, and also serves as an electric radiator calculator and a room heating calculator1.
"We’re pleased to announce the launch of our newly updated Free Online Heating Calculator, designed to help homeowners quickly and easily understand their heating needs."
The Advanced Heating Calculator is described as a more detailed solution for multi-room and multi-property assessments1. According to Dimplex, it allows users to create single or multi-property projects, obtain room-by-room heating recommendations and produce customer proposals1. Access requires joining the Dimplex PRO Installer Club, where the company says Club Partners receive exclusive access to the calculator alongside other rewards1.
Dimplex says accurate heating requirements matter for comfort, efficiency and cost-effectiveness, and that the calculator is intended to answer questions about a room's heating requirement, the size of heater or radiator needed, and the factors affecting room temperature1. The company states that using the calculator allows a home to be heated with solutions tailored to the size, usage and insulation levels of each room1.
| Tool | Access | Stated purpose |
|---|---|---|
| Free Online Heating Calculator | No login required, on the Dimplex website | Room heating guidance for homeowners, landlords and DIY users; results in kW |
| Advanced Heating Calculator | Dimplex PRO Installer Club membership | Multi-room and multi-property assessments, room-by-room recommendations, customer proposals |
Why it matters for households
Sizing a heater to a room is a practical step in controlling how much electricity a home uses for heat, particularly where a household relies on electric heating rather than a gas boiler. A tool that converts a room's requirement into kW gives a figure that can be checked against the output rating on a storage heater or a heating panel, and against the property's supply arrangements. Dimplex's stated inputs include room size, usage and insulation, which are the same variables that determine whether a heater runs continuously at full output or cycles on and off.
For a household weighing up electric heating and heat pumps, an output figure produced before purchase is one of the few pieces of information available without an on-site survey. The free version requires no account, so no personal details are exchanged to obtain a result. The installer-facing version sits within a manufacturer's membership scheme, which means the more detailed multi-room assessment is not directly available to householders.
Dimplex has not reported how the updated calculator differs in its calculation method from the previous version, nor whether the results have changed. No independent verification of the tool's accuracy has been reported.
What happens next
No further dates or product changes have been announced. The free calculator is available now on the Dimplex website, and the Advanced Heating Calculator is available to members of the Dimplex PRO Installer Club1.