Warmth from the floor up, or the wall out?
Choosing between underfloor heating and traditional radiators is one of the more common questions we hear during renovations and new builds across Norwich and the wider Norfolk area. Both keep a home warm, but they behave very differently on cost, comfort and long-term efficiency. Here is an honest, jargon-free comparison to help you decide.
How each system heats a room
Radiators work largely by convection. They heat the air immediately around them, which rises, circulates and eventually warms the room. Because the water flowing through them typically runs hot (often around 60–75°C on older systems), they heat a space quickly but can leave cold spots and uneven temperatures.
Underfloor heating (UFH) turns the whole floor into a gentle, low-temperature radiator. Heat rises evenly across the entire room from below, so you get a more consistent temperature from floor to ceiling and no cold corners. Many people find this a noticeably more comfortable form of warmth.
Wet versus electric underfloor heating
There are two main types of UFH, and the difference matters:
- Wet (hydronic) UFH uses a network of pipes laid under the floor, connected to your boiler or heat pump. It suits whole-house heating and larger areas, and it is the more efficient choice to run.
- Electric UFH uses heating mats or cables powered directly by electricity. It is cheaper and simpler to install, warms up quickly, and is ideal as supplementary heating in a single room such as a bathroom or kitchen.
As a rough guide, electric UFH tends to cost less per square metre to install than wet systems, but because electricity is far more expensive per unit than gas, it is usually not the right choice for heating a whole home.
Running costs compared
This is where the picture becomes clear. Gas currently costs only a fraction of what electricity does per kilowatt hour, so how a system is powered matters enormously.
- Electric UFH is expensive to run as a primary heat source and is best reserved for small rooms or occasional use.
- Wet UFH connected to a gas boiler generally runs at a similar or lower cost than radiators, because it operates at a lower water temperature and distributes heat more efficiently.
- Wet UFH paired with an air source heat pump can be the most efficient combination of all, as heat pumps work best at the low flow temperatures UFH is designed around.
We would avoid quoting exact annual figures, as they depend on your home’s insulation, size, floor covering and how you use the heating. Treat any online figures as broad guides rather than promises.
Efficiency and comfort
Wet underfloor heating can be more energy efficient than radiators because it heats water to a lower temperature. Lower flow temperatures suit modern condensing boilers and heat pumps, which run most efficiently when they are not being pushed to high output.
On comfort, UFH usually wins. There are no hot radiator surfaces, no dust-collecting convection currents, and no bulky panels taking up wall space, which is a genuine bonus in smaller rooms or open-plan layouts. Radiators, however, respond faster. If you want a room warm within minutes, a radiator delivers heat far more quickly than a wet floor, which can take a couple of hours to reach temperature.
Installation considerations
Radiators are simpler and cheaper to install or replace, especially in an existing home where the pipework is already in place. Underfloor heating, particularly wet systems, is far easier to fit during a new build, extension or major renovation when floors are already up.
Key things to weigh up:
- Floor build-up and height. Wet UFH adds depth to the floor, which can affect door heights and thresholds. Retrofit low-profile systems exist but add cost.
- Floor covering. Tile and stone work best with UFH; thick carpets act as insulation and reduce effectiveness.
- Response time and controls. UFH benefits from good zoning and smart thermostats so each room can be managed independently.
- Disruption. Retrofitting wet UFH into an occupied home can be significant work, so it is often best planned alongside other renovations.
Which should you choose?
For a new build or full renovation, wet underfloor heating offers excellent comfort and efficiency, particularly if you are considering a heat pump. For a single room upgrade such as an en-suite or kitchen, electric UFH is a sensible, cost-effective touch of luxury. For quick, affordable heating in an existing home, well-sized modern radiators remain a reliable and practical choice, and combining both systems in one property is perfectly possible.
The right answer depends on your property, budget and plans, which is exactly why it is worth talking it through with a qualified engineer before committing.
Talk to Norfolk Heating Ltd about your options
If you are weighing up underfloor heating against radiators for your Norwich home, our Gas Safe registered team can assess your property and recommend the most efficient, comfortable solution for your budget. Call us on 07751 261207, email enquiries@norfolkheatingltd.co.uk, or visit us at Prestige House, Avian Way, Norwich NR7 9AR. We are open Monday to Friday, 7:30am to 5:00pm and always happy to help.
