Heating Calculator

Need to choose the right heating level for your room?

Fill out as much information as you have, the more information you enter the more accurately we can predict your requirements.

Unit Type:

Metric (Metres)

Imperial (Feet/Inches)

Room Size

Welcome to Electricpoint's Free Electric Heating Calculator Tool – your go-to resource for calculating the kW needed to heat the rooms in your home and selecting the right electric radiators to meet those requirements.

Electric heating is a smart choice for UK households, offering flexibility, quick installation and potential savings on energy bills. Unlike traditional gas boilers, electric radiator systems offer zoned control, meaning you only heat the rooms you use. This can lead to significant reductions in your annual heating bill.

Our electric heating calculator uses information like room dimensions and insulation levels to provide accurate results. The more details you enter, the better we can help you avoid common pitfalls like oversizing radiators, which wastes energy. Start by selecting metric or imperial units, then input your data for instant results showing exactly how many kW you need to heat your room and which electric radiators will fulfill this.

How to Use Our Heating Calculator:

  1. Select Unit Type: Choose Metric (Metres) or Imperial (Feet/Inches) if preferred. This ensures accurate measurements for your space.
  2. Enter Room Details: Input your room’s dimensions, number, type and size of windows, floor type, insulation quality and room type. Our tool factors in all of this information for precise electric radiator sizing results.
  3. Review Results: Get outputs like recommended wattage (e.g., 1,500W for a 20m² room) and product suggestions.
  4. Choose Your Radiators and Add to Basket: Use the results to select electric radiators from our range. Our wattage progress bar will guide you, indicating when your chosen radiators meet the required wattage to heat your room effectively.

Heating FAQs

Why Choose Electric Heating for Your Home?

Electric heating is a modern, versatile solution for home heating, offering unique benefits over gas or oil systems. Our electric heating calculator helps you find the right kW to heat your rooms and select ideal radiators.

Tailored Comfort with Style

Electric systems provide consistent, easily controllable warmth. Choose from a range of stylish options in a range of outputs to match your decor and heating requirements.

Hassle-Free Installation

Unlike gas boilers needing complex pipework, electric radiators install in hours with no annual servicing, saving time and costs.

Flexible Heating Control

Heat only the rooms you use with zoning, perfect for adapting to your lifestyle. Pair with smart thermostats for precise scheduling, enhancing comfort while minimising energy use.

Is Electric Heating Energy Efficient?

Electric heating delivers top-tier efficiency when optimised with smart features and proper sizing. Our electric radiator sizing calculator ensures you select radiators that meet your room’s kW needs without waste.

No Energy Loss

Electric radiators convert 100% of electricity into heat, unlike gas boilers losing 10-20% through flues, ensuring every watt counts.

Optimised Sizing for Savings

Choosing the correct wattage prevents overuse. For example, a well-insulated 15m² bedroom may need only 1000W, while a drafty one may require 1300W. Our home heating calculator calculates individual room requirements precisely, reducing unnecessary power consumption.

Smart Features Boost Performance

Programmable timers and apps like Rointe Connect allow targeted heating, cutting usage by up to 25% by focusing on occupied rooms according to UK energy studies.

Are Electric Radiators Eco-Friendly?

Electric radiators are a green heating choice, supporting sustainability with minimal environmental impact.

Zero On-Site Emissions

Unlike gas or oil boilers, electric radiators produce no carbon emissions during operation, aligning with the UK’s 2050 net-zero goals.

Renewable Energy Compatibility

Electric heating systems can be powered by self-generated solar energy or paired with green energy tariffs significantly reducing reliance on fossil fuels.

Advanced Eco Features

Features like Open Window Detection and Geo-Fencing enhance sustainability. Open Window Detection pauses heating during ventilation, while Geo-Fencing preheats only when you’re nearing home, ensuring efficient energy use.

How Does Electric Heating Work?

Electric heating provides instant, efficient warmth with 100% point-of-use efficiency. Our electric heating calculator determines the kW needed and suggests radiators to achieve it.

Instant Heat Generation

Electricity flows through resistive elements in radiators, producing immediate warmth without the flue losses of gas boilers.

Versatile Heating Options

  • Storage Heaters: Store off-peak energy for daytime release.
  • Electric Radiators: Efficient, controllable heating for everyday use
  • Electric Panel Heaters: Quick, affordable heating for occasional-use rooms
  • Infrared Panels: Directly heat objects for focused warmth.
  • Towel Rails: Warm towels and added comfort in bathrooms

  • App-Enhanced Efficiency

  • Apps like Rointe Connect enable zoning and scheduling, heating only the required rooms to optimise performance.
    • What Size Electric Radiator Do I Need?

    Selecting the correct electric radiator size ensures efficient heating without excess energy use in your UK home. Our electric radiator sizing calculator computes the exact kW for your room and suggests matching models.

    Factors Impacting Size

    Room Size: Larger spaces need higher wattage (e.g., 1,500W for 20m²).
    Insulation: Good insulation lowers kW needs by 20-30%.
    Windows/Flooring: More windows or uninsulated floors increase heat loss.

    Calculator Precision

    Enter room dimensions, window details, insulation and floor type into our heating calculator. Results include suggested radiators and a wattage progress bar to confirm when your basket meets the kW requirement.

    Are Electric Radiators Expensive to Run?

    Electric radiators are a cost-effective heating option with proper sizing and smart features.

    Cost Influencers

    A 1,500W radiator at 26.35p/kWh (October 2025 UK rates) costs ~£1.98/day for 5 hours, varying by insulation and usage.

    Tariff Savings

    Off-peak tariffs like the British Gas Dimplex Quantum Tariff (9.9p/kWh overnight) can save 30-50%, reducing the same radiator to ~£0.75/day.

    Smart Control Efficiency

    Zoning, Open Window Detection and Geo-Fencing minimise waste, saving 20-30% versus whole-home systems.

    Insulation and Sizing

    Proper kW sizing (e.g., 1,500W vs. 1,800W for a 20m² room) and insulation can increase savings further. Our electric radiator sizing calculator ensures accuracy.

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