Technical information

The specifications behind the radTherm radiators we fit: dimensions, electrical details, how the heat-retaining core works, the thermostat options and the data sheets. Everything here comes from the manufacturer’s own catalogue and manuals.

At a glance

Specifications

These apply across the Standard, Tall and Low radiators. For every individual size and output, see styles and sizes.

Specification	radTherm Standard, Tall and Low
Depth	70mm on every model
Heights	340mm (Low), 630mm (Standard), 1240mm (Tall)
Outputs	0.5kW to 2.8kW, fifteen sizes
Room size	Each radiator suits a room of 5 to 25m²
Supply	230V, single phase
Connection	1.5m cable with a 13A UK plug, or hard-wired to an existing circuit
Protection rating	IP20 as standard, IPX4 (splash-proof) available
Protection class	Class I
Mounting	Wall-mounted; Standard and Low can also stand on feet or castors
Finish	Powder-coated steel, white as standard, in 900+ colours to order
Made in	Germany, to order

Inside the radiator

How the storage core works

Each radiator has a patented heat-retention core with the heating elements cast directly into it, so almost all of the energy goes into stored heat. Once the room reaches the temperature you’ve set, the core keeps releasing warmth for up to 45 minutes without drawing any power.

Spot-welded fins on the front and back give the radiator six times the surface area of a flat panel. That spreads the heat as a mix of radiant warmth and gentle convection, so the room feels as warm at your feet as it does at head height.

Once a room is up to temperature, a radiator draws power for around 12 to 15 minutes an hour to keep it there (radTherm’s figure), depending on the building and the thermostat settings.

A radTherm radiator with its front panel cut away to show the heat-retention core inside

Case study

A year of electricity in a Holsworthy bungalow

A 12-month case study looking at the total electrical usage (power, heat and light) in a 1960s two-bedroom detached bungalow in Holsworthy, North Devon, with cavity wall insulation, loft insulation and double glazing. There is no gas, solid fuel or other heating in the property.

Over the 12 months	Cost
Heating	£501.15
Everything else (lights, appliances, hot water)	£242.25
Total electricity for the home	£743.40

Every home is different, so we give you a running-cost estimate for your own home at the free survey.

Controls

Thermostat options

Every size can be ordered with any of these. We’ll recommend one at the survey, based on how many rooms you’re heating and how you like to control them.

DSM

App control through the DSM interface, with the longest wireless range. Room-by-room schedules, open-window detection, an Away setting and a history of temperatures and energy use. Supports ErP-compliant operation.

DSD

Connects directly to your Wi-Fi router, no interface needed. Set in 0.5°C steps from 0 to 30°C, with adaptive start, open-window detection, a 24-hour boost and a key lock.

D-Basic

Two buttons on the radiator, each press moving the temperature by 1°C. Connect it to Wi-Fi later and it works with the same app as the others.

RF

A built-in 868MHz radio receiver for an external wireless thermostat, with a range of around 30 metres indoors depending on the building.

The radTherm app works with Alexa and Google Assistant, so you can change a room’s temperature by voice.

Smart control and the app

Safety and standards

Built to be safe in every room

Overheating protection

Protection is built into each radiator at several points, and the steel body is powder-coated inside and out against corrosion.

Cooler surfaces when you need them

DSD thermostats can limit output to 70% for a lower surface temperature, or 50% in Babycare mode. Low-temperature models are also available.

Ecodesign compliant

Seasonal space heating efficiency (ηS,el) of 96.0%, with weekly time control, open-window detection and adaptive start, as the Ecodesign rules for electric heaters require.

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