Electric boilers for radiators

Electric boilers for radiators are used on a wet central heating system, as opposed to electric radiators. Normally used when gas or oil boilers can’t be installed or when the user wants an energy efficient and environmentally friendly (by not burning fossil fuels as with a gas boiler or oil boilers) central heating system.

You can also reduce or eliminate your carbon footprint when using electricity generated via environmentally friendly renewable sources, such as wind, tidal or PV solar panels, and not burning fossil fuels and thus no carbon monoxide leak risks.

Electric boilers heat radiators in a very simplistic way; they work just like a kettle works, except the immersion heaters or elements are in a sealed heat exchanger system to heat the hot water.

Electric boilers are compact (can be fitted in a airing cupboard for example) with a lightweight design, which ensures easy installation of your electric heating solution for radiators.

Our electric boilers have a high heat output modulation ratio and come with a weather compensation system which reduces how much electricity is consumed and reduces energy bills,carbon emissions and running costs, as the boiler adapts the desired temperature of the flow and heat output to the external weather temperature; thus, less energy is required for your home heating, thus reducing heating bills.

Can electric boilers heat radiators?

Yes, electric boilers can be paired with various types of central heating radiators, including aluminium radiators, steel panel radiators, aesthetic-focused designer radiators and cast iron radiators.

There are also “cased radiators”, which are called low surface temperature (LST) radiators.

An “LST” radiator is a standard hot water radiator enclosed in a protective casing that limits the external surface temperature, typically to ≤ 43°C, even when the heating water is much hotter.

This prevents burns or scalding from prolonged contact with radiators.

There is UK guidance (NHS / HBN / HTM standards) which sets 43°C as the safe limit of the radiator casing temperature, which is especially important for:

• Children
• Elderly
• Disabled users
• People with reduced sensation or mobility

They are very common in commercial & public buildings (often required by regulation, not optional):

• Hospitals & NHS buildings
• Care homes & nursing homes
• Schools & nurseries
• Mental health facilities
• Prisons
• Some social housing
• Specialist domestic installs (e.g., dementia care)

There are also fan-assisted radiators, which have a built-in fan within the radiator. These fan assisted radiators are a great heating solution when using modern low-temperature central heating systems, which have a flow heating temperature of 50°C or even lower, or when there is limited wall space to have the radiators installed.

All of these radiator types can be fed by electric boiler systems. Our electric boilers can supply raiditor and underfloor heating systems if so required.

All radiators should be sized to the BS EN442 standard of power output.

We have a webpage dedicated to “What size electric boiler do I require?”, which has some quick rules of thumb and a link to a very accurate heat loss calculator here: What size electric boiler do I need?

Product range

Our electric boiler range benefits from modern weather compensation and optimisation. Making use of an electric boiler with radiators reduces your carbon emissions, as the boiler works in a more efficient manner.

Our electric boiler range benefits from modern weather compensation and optimisation systems that adapt the boiler’s flow and return temperatures to external weather conditions. Thus improving efficiency, reducing your carbon footprint and helping save money on energy bills for your property.

8kW electric boiler

FHMN3-8  The 8kW electric system boiler features an outdoor sensor, a 5-litre expansion vessel, and a circulating pump; is PV solar-ready; and has an adjustable output range of 2kW, 4kW, 6kW, and 8kW of heating power, with options for 230V Single phase or 400V Three phase powered.

This electric boiler modulates to the following heat output steps: 

0.8kW, 0.9kW, 1.3kW, 2kW, 2.6kW, 3.3kW, 4kW, 4.6kW, 5.3kW, 6kW, 6.6kW, 7.3kW, 7.9kW

So yes, this electric central heating system boiler can be set to either 2kW, 4kW, 6kW or 8kW (technically 7.9kW, but close enough to 8kW for us), and the boiler will ramp up and down the above modulation scale depending on what the heating system demands.

This electric boiler is the best option for those seeking a 6kW electric boiler to heat radiators for heating requirements in flats or small apartments and much cheaper than a heat pump heating solution, for example.

14kW electric boiler

The FHMN3-14 is a 14 kW electric system boiler that includes an outdoor sensor and a 5-litre expansion vessel,circulating pump, and is PV solar ready, and has an adjustable output range of 6.9 kW, 9.2 kW, 11.5 kW, or 13.8 kW of heating power, operating on 1 phase/230 volts only.

This electric boiler modulates according to the following heat output steps: 

0.8kW, 1.5kW, 2.3kW, 3.5kW, 4.6kW, 5.8kW, 6.9kW, 8.1kW, 9.2kW, 10.4kW, 11.5kW, 12.7kW, 13.8kW 

This electric boiler can be set to either 6.9 kW, 8.1 kW, 9.2 kW or 13.8 kW (technically 13.8 kW but close enough to 14 kW for us), and the boiler will ramp up and down the above modulation scale depending on the heating system’s demands.

This electric boiler is the best option for those seeking a 12kW electric boiler  for a radiator heating requirements.

The largest model in this range is our 24kW electric boiler

FHMN3-24: A 24 kW electric boiler with an outdoor sensor, cascade, 5-litre expansion vessel, and circulating pump that is PV solar-ready, with a 12 kW, 16 kW, 20 kW, or 24 kW adjustable output range—400 Volt, Three Phase powered only.

This 24 kW electric boiler modulates to the following heat output steps: 

1kW, 2kW, 4kW, 6kW, 8kW, 10kW, 12kW, 14kW, 16kW, 18kW, 20kW, 22kW, 24kW

This electric boiler can be set to either 12 kW, 16 kW, 20 kW, or 24 kW of heating power, and it will ramp up and down the above modulation scale depending on what the heating system demands.

These boiler come with a 2 year warranty

This brochure details this above range 

M range electric heating boilers brochure from 2kW to 24kW of output Flexiheat UK 

Manual for this range

M range electric boilers technical and installation manual 2kW to 24kW from Flexiheat UK

We go larger in our domestic-sized boilers, up to 45 kW, and these are listed on this webpage – Electric central heating boilers 

Or

If you’re looking for electric boilers with outputs up to 96 kilowatts of performance output, then these are our commercial wall-hung electric boilers, which are listed here – Commercial wall hung electric boilers from 28kW to 96kW

Energy efficiency

Electric boilers heat radiators with 100% energy efficiency, which is higher than a gas boiler or oil boilers.

Electric boilers are 100% energy efficient when it comes to the immersion heaters (heating elements) inside the boiler; however, some argue that the overall energy efficiency of electric boilers is 99.9% because the control panel uses a small amount of electricity which flows into the electric boiler system.

Home heating with electric boiler systems

Electric boilers require less maintenance because they don’t have any moving parts.

However, regular maintenance is important to extend the lifespan of electric boilers and maximise their performance and efficiency. We recommend an annual service on the central heating system to ensure the water quality is in excellent condition.

Key benefits

Electric boilers can work in conjunction with solar panels to enhance energy efficiency.

Installation costs,maintenance costs and boiler costs are less than gas boilers and oil boilers.

Any heating engineer in conjunction with an electrician can fit our electric flow boilers.

Electric boilers operate almost silently due to the absence of combustion processes and better for the environment.

Electric boilers are ideal for off-grid homes without access to natural gas supply or gas grid or when an oil tank is not desired.

Electric boilers use electricity to heat water instead of gas or oil.So, no risk of carbon monoxide poisoning or gas leaks.

Domestic hot water

Our boilers can be used for heating only or central heating & domestic hot water (DHW). When used with an indirect cylinder (which can be an unvented or an open-vented DHW system), you can provide ample amounts of domestic hot water for your bath or shower, as well as your kitchen / dishwashing needs. We highly recommend an unvented indirect cylinder, due to the benefits of mains water supply cold water pressure DHW and the flow rates that can be achieved for your hot water demands with hot water storage cylinders.

A diagram showing how our electric central heating boiler is connected to a domestic hot water cylinder. Thus heating and hot water

Why is this setup important?

Because you can have two required temperatures – i.e., the heating side of the boiler, which may be running a radiator heating solution – which needs a maximum temperature of 50°C or so, or if the boiler is compensating the flow temperatures to a radiator system, it may have reduced the water flow temperature to 30°C or 45°C , which is not a high enough temperature to heat the indirect DHW cylinder as any stored water should be at least 60°C,so the flow tepmperaure to the coil of the cylinder, must above this figure to ensure heat transfer to the DHW.

Contact Flexiheat UK

For more information, support, prices, checking stock, purchasing or ordering our cost-effective electric boilers for radiators, please don’t hesitate to contact our customer sales team at 01202 822221. Please click here for our email contact form. We serve both trade customers and end users.