Technical guidance by Daxom. This guide is based on Daxom product specifications and installation documentation, with external standards and regulatory sources identified where relevant. Product suitability should be confirmed for the individual property by an appropriately qualified installer or electrician.

Choosing the right electric boiler for your home means finding the right balance between central heating performance, domestic hot water capacity, energy consumption and installation requirements.

Daxom 12kW electric boilers provide an alternative to traditional gas and oil heating systems. Designed for properties with a suitable electrical supply, the range includes compact electric combi boilers and innovative models with integrated hot water cylinders in 50-litre, 80-litre and 120-litre capacities.

In this guide, we explain how Daxom electric combi boilers work, their advantages and limitations, their hot water performance and how to choose the best 12kW electric boiler for your home.

What Is an Electric Combi Boiler?

An electric combi boiler provides central heating and domestic hot water using electricity rather than gas or oil.

Like a gas combi boiler, it heats water for a wet central heating system, supplying radiators or compatible underfloor heating. It also provides hot water for showers, baths, kitchen taps and bathroom basins.

However, electric boilers have different electrical requirements and hot water delivery characteristics compared with gas boilers. Understanding these differences is essential when choosing the right system.

Daxom offers several 12kW electric boiler configurations, including compact combi models and units with integrated hot water storage cylinders.

What Are the Benefits of Daxom 12kW Electric Boilers?

1. Compact Design for Smaller Spaces

Daxom electric combi boilers are designed to provide central heating and domestic hot water without the need for a combustion flue or gas supply.

Compact models combine the main boiler components in one unit, making them suitable for installations where space is limited. Depending on the model, installation requirements and access, they may fit into a kitchen cupboard, utility room or under-stairs area.

Models with integrated cylinders offer additional hot water storage while keeping the boiler and cylinder together in one appliance.

2. Quiet Electric Boiler Operation

Electric boilers do not burn gas or oil to generate heat and do not require the combustion fans and flue systems used by conventional fuel-burning boilers.

Daxom electric boilers are designed for quiet operation.

This makes an electric boiler an attractive option for homeowners who prefer a quieter heating system.

3. Easy-to-Use Digital Controls

Daxom electric boilers feature a digital display and control panel to help users manage their heating settings.

Depending on the model and compatible accessories, control options may include a room thermostat, app-based controls or manual operation.

Appropriate temperature settings and heating schedules can help manage energy consumption and household comfort.

4. No Gas Supply or Oil Storage Required

An electric boiler does not require a gas connection, oil tank or combustion flue. This can be particularly useful for properties without access to mains gas.

Installation may also be more straightforward where suitable electrical infrastructure and existing wet central heating pipework are already in place.

However, installation costs depend on the electrical supply, circuit requirements, plumbing alterations and any additional work needed to accommodate the appliance. For practical system preparation, commissioning information and model documentation, see the Daxom electric boiler installation guide.

5. No Combustion-Related Components

Electric boilers do not need many of the components found in gas and oil boilers, including gas valves, ignition electrodes and combustion air systems.

This can reduce the number of combustion-related components that may require repair. Electric boilers still contain electrical and hydraulic components that need appropriate maintenance and servicing when necessary.

6. Compatible with Solar Electricity

Daxom electric boilers can be considered for installations using solar photovoltaic panels, subject to the model, electrical system and control arrangements.

Using solar-generated electricity when it is available may help reduce the amount of electricity purchased from the grid. Actual savings depend on solar generation, household demand, electricity tariffs and the boiler’s operating schedule.

Are Daxom Electric Boilers Safe?

Electric boilers do not burn gas or oil, so they do not produce carbon monoxide through their own heating process. They also do not require a combustion flue.

Nevertheless, electrical safety is essential. The boiler must be installed according to the manufacturer’s instructions, with suitable wiring, circuit protection and any required residual current protection.

The absence of a gas appliance does not remove other legal obligations relating to electrical safety, property maintenance or rental accommodation.

A suitably qualified installer should confirm that the electrical supply and installation meet the applicable UK requirements.

Are Daxom Electric Boilers 99.9% Energy Efficient?

Electric resistance boilers convert almost all the electricity consumed by their heating elements into heat at the point of use.

It is important to distinguish energy conversion efficiency from running costs. Electricity can cost more per kilowatt-hour than gas, depending on the tariffs available.

Consequently, a highly efficient electric boiler does not automatically cost less to run than a gas boiler. The overall cost depends on the property’s heat demand, energy prices, heating controls and alternative heating options.

What Are the Limitations of a 12kW Electric Combi Boiler?

Electrical Supply Requirements

Many UK homes have a single-phase electricity supply operating at a nominal voltage of 230V. The available electrical capacity varies between properties.

A 12kW electric boiler draws approximately 54A at 230V when operating at full output. This represents a substantial electrical load that must be considered alongside the rest of the home’s electricity consumption.

The suitability of a 12kW boiler depends on the incoming supply, existing consumer unit, protective devices, wiring and other household appliances.

A boiler above 12kW is not automatically unsuitable on a single-phase electricity supply , higher outputs may require a different electrical arrangement or supply upgrade.

Before installation, a qualified electrician should assess the available capacity and confirm the appropriate circuit protection and any necessary upgrades.

Can a 12kW Electric Boiler Heat a House?

A 12kW electric boiler may be suitable for a property of up to approximately 140m² under appropriate conditions, according to Daxom’s stated guidance.

However, floor area alone cannot determine whether a boiler is suitable.

The property’s insulation, glazing, ceiling heights, ventilation, local outdoor temperatures and radiator sizes all influence the heating demand. A professional heat-loss calculation is the best way to determine the required boiler output.

Domestic Hot Water Flow Rate

One of the main limitations of a compact 12kW electric combi boiler is the amount of hot water it can deliver.

The Daxom Compact Electric Combi Boiler Single Phase 12kW is specified to provide approximately 6.9 litres at 55°C of hot water per minute at a 25°C temperature rise.

This may be suitable for a shower when paired with an appropriate thermostatic mixer valve and shower head. Actual performance depends on incoming water temperature, flow rate and installation conditions.

Filling a bath can take considerably longer than with a higher-output hot water system. A compact 12kW electric combi boiler may therefore be less suitable for households that regularly require large volumes of hot water in a short period.

What Is a Soft-Start Electric Boiler?

Daxom describes its 12kW electric combi boilers as soft-start units.

According to the supplied product information, the boiler starts at approximately 4kW and increases towards its full 12kW output over around 60 seconds.

This staged operation means the boiler does not immediately provide its maximum heating output when a hot water outlet is opened. Depending on the operating conditions, there may be a short delay before the desired hot water temperature is reached.

For households with greater hot water requirements, an integrated cylinder can provide an alternative to relying entirely on instantaneous hot water production.

How Daxom Addresses the Hot Water Limitations of Compact Electric Combi Boilers

Daxom has developed 12kW electric boilers with integrated hot water cylinders in three capacities: 50 litres, 80 litres and 120 litres.

These models combine central heating with stored domestic hot water. The integrated cylinder provides a reserve of heated water for periods of higher demand, while the boiler reheats the stored water as required.

This can be useful for households that want an electric boiler but need more hot water capacity than a compact instantaneous combi boiler can provide.

The available models are designed around different installation formats and storage requirements.

Daxom 12kW Electric Boiler with Integrated 50-Litre Cylinder

Model: UKDAX-12EBM — Wall-Hung Electric Combi Boiler

View the Daxom 12kW Electric Combi Boiler with Integrated Cylinder

The Daxom UKDAX-12EBM combines a 12kW electric boiler with a built-in 50-litre domestic hot water cylinder.

Its wall-hung design makes it an option for households looking for integrated hot water storage without installing a separate cylinder elsewhere in the property.

How Quickly Does the 50-Litre Cylinder Heat Up?

According to the supplied product information, the initial heating time for 50 litres of water to reach 65°C is approximately 10 minutes under the stated operating conditions.

Actual heating time depends on the incoming water temperature and the amount of water being heated.

Once heated, the stored water can be used for showers, taps and other domestic hot water requirements. When water is drawn off, the boiler can reheat the cylinder according to its controls and operating conditions.

During moderate hot water use, the boiler may be able to reheat the stored water while demand continues. The available hot water and recovery performance depend on the rate of use and the system’s operation.

The integrated cylinder is designed to provide a useful hot water reserve while keeping the appliance compact.

Daxom 12kW Floor-Standing Electric Boiler with an 80-Litre Cylinder

Model: UKDAX-80Y12BT

View the Daxom 12kW Electric Boiler with an Integrated 80-Litre Cylinder

The Daxom 80-litre electric boiler is designed for households that require a larger stored hot water capacity.

Its floor-standing format is intended to integrate into suitable kitchen or utility spaces. Depending on the installation requirements, it may also be suitable for an under-stairs location or another appropriate area.

How Quickly Does the 80-Litre Cylinder Heat Up?

Daxom’s supplied product information gives an approximate initial heating time of 17 minutes for the 80-litre cylinder to reach 65°C, depending on the incoming water temperature and operating conditions.

The larger cylinder provides more stored hot water than the 50-litre model. This may be beneficial for households with greater hot water requirements or a preference for stored hot water rather than relying entirely on instantaneous production.

Before choosing this model, check the appliance dimensions, installation clearances, plumbing connections and floor loading requirements.

Daxom 12kW Floor-Standing Electric Boiler with a 120-Litre Cylinder

Model: UKDAX-120Y12BM

View the Daxom 12kW Electric Boiler with an Integrated 120-Litre Cylinder

The Daxom 120-litre model offers the largest integrated hot water cylinder in this 12kW range.

It is designed for households that need a greater reserve of stored domestic hot water, particularly where several people may use showers, baths and taps throughout the day.

How Quickly Does the 120-Litre Cylinder Heat Up?

According to the supplied product information, the average initial heating time for 120 litres of water to reach 65°C is approximately 21 minutes, subject to incoming water temperature and operating conditions.

The larger cylinder provides additional stored hot water, but the amount available at the required temperature depends on factors including water mixing, incoming water temperature, the volume drawn off and the recovery rate.

This model may be worth considering where hot water storage capacity is a priority and sufficient installation space is available.

Which Daxom 12kW Electric Boiler Is Right for You?

Choosing the right Daxom electric boiler depends on your property’s heating demand, the number of occupants, hot water usage, available installation space and electrical supply.

The following comparison summarises the main differences between the four configurations.