UK home heating system comparison

Avoid £1,500 in servicing: Electric radiators vs central heating (UK)

For flats, well insulated homes and single rooms, electric radiators are usually the smarter buy; for larger or daughter houses, central heating still tends to win on running costs. The gap comes down to unit price versus installation disruption: electricity costs more per kWh, but electric radiators are cheaper and quicker to fit.

The sections below break down the real numbers.

TL;DR:

  • Electric radiators are most cost-effective for well-insulated flats or single rooms, as they are quick to install and require minimal disruption.
  • Gas central heating remains cheaper for large or poorly insulated homes due to its lower unit cost and higher output capacity.
  • Installing electric radiators can involve hidden costs, such as rewiring or electrical upgrades, especially when adding multiple units.
  • Running costs depend heavily on tariffs, with time-of-use plans benefiting electric heating through cheaper overnight rates, especially when paired with solar.
  • Maintenance differences are significant, with electric radiators requiring only safety checks every five years and gas systems needing annual servicing.

Table of Contents

Electric radiator vs central heating: the honest pros and cons

Every heating decision comes down to trade-offs, and this one has clear winners depending on what you’re optimising for.

Electric radiators earn their keep in a few specific ways:

  • Nearly 100% point-of-use efficiency — nearly every watt drawn becomes heat in the room, with very little lost to flues or pipework
  • Room-by-room control — you heat the rooms you’re using and leave the rest cold, which suits flats and part-time occupancy
  • Low maintenance — no annual servicing requirement, just periodic safety checks
  • Fast installation — often a day’s work per radiator, with no pipework to route

The drawbacks are just as real. Electricity costs more per kWh than gas, so even with perfect efficiency, running several electric radiators through a UK winter can cost more than a gas system heating the same space. Wiring in multiple hardwired units can also mean electrical upgrades you didn’t budget for.

Central heating (gas boiler and wet radiators) has the opposite profile:

  • Lower unit cost per kWh, which usually means cheaper bills for whole-house heating
  • Strong output for large spaces, where a boiler and radiator network heats consistently through bigger footprints
  • Established infrastructure in most UK homes, so like-for-like boiler swaps are relatively routine

Its downsides are installation-side: annual servicing is compulsory for safety and warranty, and a first-time system needs flues, pipework and access to every room, which means more mess and more time.

Installation costs, disruption and how long the work takes

Budgeting for either option means separating the sticker price from the disruption price, because they don’t always move together.

Replacing a full gas central heating system, especially a first-time install with no existing pipework, typically runs into several thousand pounds once you add the boiler, radiators, pipework and labour. Checkatrade’s cost guides show gas installs consistently sitting above basic electric alternatives on upfront price. Fitting individual electric radiators costs less per unit and involves far less mess, since there’s no pipe routing through walls or floors.

Typical timeline gap: a full gas system replacement can take several days to a week per property, involving trades in every room; swapping in electric radiators is often a same-day job per room, with no plastering or flooring disruption.

Where the hidden costs creep in:

  • Consumer unit upgrades if you’re adding multiple hardwired electric radiators to an older supply
  • Removal and disposal of the old boiler, tank or radiator network
  • Making good walls and floors after gas pipework is lifted or rerouted
  • Rewiring costs if an electrician’s survey flags insufficient capacity

If you’re only replacing one or two radiators rather than rewiring a whole house, our guide to oil filled radiator costs gives a clearer sense of what a smaller job actually costs.

Running costs and tariffs: working out what you’ll actually pay

Unit price is where the electric-versus-gas argument really lives, and it’s more nuanced than “gas is cheaper”.

Electricity costs more per kWh than gas, and Ofgem’s price cap moves both figures periodically, which shifts the comparison every few months. Point-of-use efficiency doesn’t fully close that gap: electric heaters convert nearly 100% of electricity into heat, but a boiler’s lower unit cost often still wins on a big house with constant heating demand.

Time-of-use tariffs change the sum. Economy 7, Economy 10 and newer flexible tariffs let you shift consumption into cheaper overnight windows, which suits storage heaters and radiators with timers far better than a system running flat-rate all day.

To estimate your own monthly cost:

  1. Check your radiator’s wattage and the hours per day you’d realistically run it
  2. Multiply watts by hours to get daily kWh, then multiply by your unit rate
  3. Compare that figure against your current gas-and-electric combined bill for the same rooms
  4. Repeat for off-peak rates if you’re on a time-of-use tariff

Pairing electric radiators with solar or a flexible tariff can meaningfully improve the economics of running them, which is worth factoring in before writing electric off on cost alone.

Maintenance, lifespan and the whole-life cost picture

Servicing frequency is one of the starkest differences between the two systems, and it’s often underweighted in the initial buying decision.

Gas boilers need annual servicing at roughly £100 a year to stay safe and keep warranties valid, and typically last around 15 years before replacement. Electric radiators need far less: the Energy Saving Trust notes periodic safety checks every five years are usually sufficient, with no annual servicing requirement at all.

That difference compounds over a decade or two:

  • Fifteen years of boiler servicing adds roughly £1,500 to the whole-life cost before you even count breakdowns
  • Electric radiators avoid that recurring bill, though replacement parts and eventual unit swaps still apply
  • Warranty terms vary by manufacturer, so check what’s covered before assuming a like-for-like guarantee

Pro Tip: Keep a simple log of every service, safety check and repair, whichever system you choose. Buyers and surveyors both ask for service history, and a documented boiler or radiator record can smooth a sale later.

If you’re maintaining an existing wet system, our piece on how to bleed a radiator covers the one job most homeowners can do themselves.

Efficiency, carbon impact and where heat pumps fit in

Efficiency numbers look simple until you dig into what they’re actually measuring.

Gas boilers, even condensing models, lose some energy to the flue and to pipework running through unheated spaces, so their real-world efficiency sits below the headline number.

Carbon is a different question from cost, and it’s shifting fast:

  • The UK’s electricity grid mix keeps getting cleaner, which lowers the lifetime emissions of anything running on electricity
  • Gas combustion emits carbon at the point of use regardless of how the grid decarbonises
  • As the grid gets greener, the environmental case for electric heating strengthens year on year, even where the cost case doesn’t

Heat pumps sit alongside standard electric radiators as a third option worth knowing about: they typically deliver more heat per unit of electricity than direct electric radiators, but the install cost is considerably higher and suits homes with the space and insulation to support one. For most flat and room-by-room upgrades, straightforward electric radiators remain the simpler route.

Which system suits your home: a practical checklist

The right answer depends far more on your property than on a general efficiency league table.

Electric radiators tend to win in flats, well insulated new-builds, garden rooms, and off-grid properties with no gas connection. Central heating tends to win in larger, older or poorly insulated houses where constant whole-home heating demand favours gas’s lower unit price. A thermal imaging survey before you decide can reveal exactly where a property is losing heat, which changes the maths on either system.

Before you commit, work through this checklist with any installer or quote:

  1. Ask for an electrical load survey if you’re considering multiple hardwired radiators
  2. Get a clear view of your current insulation standard, and whether upgrading it first changes the calculation
  3. Request an annual running-cost estimate based on your actual room sizes and occupancy pattern, not a generic average
  4. Compare installed cost, not just unit price, across both options
  5. Check what tariff you’re on, and whether switching to a time-of-use tariff changes the electric option’s appeal

Electrical capacity and safety checks before switching

Skipping this step is the single most common reason electric heating projects run over budget.

Adding several hardwired electric radiators to a property built for a modest electrical load can trip a consumer unit or expose you to an undersized supply, and neither shows up until the radiators are already fitted. The Energy Saving Trust recommends commissioning a full load survey from a qualified electrician before committing to a whole-house switch.

Expect any competent electrician to confirm:

  • RCD protection on the circuits feeding your new radiators
  • Correctly rated wiring and breakers for the combined load
  • A periodic inspection schedule in line with current wiring regulations

Pro Tip: If you’re already having electrical work done, such as a rewire or consumer unit replacement, get your electric heating load assessed at the same time. Bundling the survey into planned works avoids paying for a second visit later.

Simco Direct’s take on choosing between the two

We spend our days helping homeowners and landlords work through exactly this decision, from single-room electric radiator swaps to full commercial heating upgrades. Our product range spans electric panel radiators, tubular heaters and towel radiators, and our blog guidance exists precisely because the “right” answer changes with every property’s insulation, layout and electrical capacity.

Where we help most is sizing: matching wattage to room volume, flagging when a load survey is worth commissioning first, and pointing customers towards the right product page rather than a generic listing. Most customers use that guidance to specify one or two rooms confidently, order direct, and get delivery sorted without needing a full rewire conversation before they’ve even chosen a radiator.

— Carl

Ready to switch a room to electric?

If the numbers above point you towards electric radiators for a flat, extension or single well insulated room, Simcodirect stocks the hardware to act on it without a whole-house rewire commitment. The Dimplex Q-Rad RF Panel Radiator gives you smart, room-by-room control with the wall-mounted profile of a standard radiator, which suits exactly the zonal-heating case made throughout this guide.

We also carry electric and dual-fuel towel radiator lines for bathrooms and en suites, including the Platinum Chrome Electric Curved Towel Radiator, useful where you want heat without tying into the main wet system at all.

Every product page lists wattage and sizing guidance so you can match output to room size before ordering, and every order comes with fast UK delivery and a 30-day returns policy if the fit isn’t right. Head to the Dimplex Q-Rad product page to check sizing against your room dimensions and get your electric radiator ordered.

Sources

Back to blog