Installing an electric boiler is relatively simple. However, correct installation is essential for safety, efficiency, and long service life. Properly connecting the boiler helps prevent leaks, malfunctions, and unnecessary energy loss.
On this page, you will find practical installation tips for electric boilers, important points to consider during installation, and which components are essential for safe operation.
Where can you install an electric boiler?
You can install your boiler in different locations. The placement of the appliance has a major impact on comfort and energy consumption, so keep the following points in mind.
Preferably choose a location:
Close to the hot water outlet
In a frost-free room
Where maintenance remains easily accessible
With a solid supporting wall (essential)
The shorter the pipework, the less heat loss occurs during use. This results in faster hot water delivery and lower energy consumption.
Vertical or horizontal installation?
Many electric boilers can be installed both vertically and horizontally. However, vertical installation usually provides the highest efficiency.
Advantages of vertical installation
Better separation of hot and cold water
More usable hot water
Higher efficiency
Slower cooling
With horizontal boilers, the water layers mix more quickly, reducing the effective heat capacity.
Check whether the wall is strong enough
A filled boiler is heavy. An 80-litre boiler can weigh more than 100 kilograms when full.
Always check:
Whether the wall has sufficient load-bearing capacity
Whether suitable wall plugs and bolts are used
Whether the mounting brackets are properly secured
For larger boilers, a concrete or brick wall is recommended.
The (supplied) inlet combination valve is mandatory
An inlet combination valve (possibly the most important component) protects the boiler against overpressure and backflow of water. For closed-system boilers, this safety device is mandatory.
The inlet combination valve provides:
Overpressure protection
Backflow prevention
Safe discharge of expanding water
Always install the supplied inlet combination valve on the cold-water side, according to the indicated flow direction and lower than the boiler itself.
Use the correct connection materials
A good installation starts with high-quality connection materials. Many suppliers recommend complete connection kits so all components fit together properly.
Commonly required materials
Flexible water hoses
Compression fittings
Inlet combination valve (included)
Shut-off valve (for maintenance)
Drain valve (for maintenance)
Pressure relief discharge pipe
Electrical connection cable (pre-installed)
Mounting brackets (pre-installed)
Suitable wall plugs and bolts
Always check in advance which connection sizes your boiler requires.
Electrical connection of the boiler
An electric boiler uses a relatively high amount of power. Therefore, a safe electrical connection is essential.
Important points of attention
Use a grounded power outlet
Check whether the electrical circuit has sufficient capacity
Use a dedicated circuit for higher power outputs
Never connect the boiler using an extension cable
Ensure proper grounding
For larger boilers or higher power ratings, it is advisable to have the electrical connection checked by a professional installer.
Switching on the boiler
Important: First completely fill the boiler with water (open the hot water tap until a constant flow of water comes out) and vent the system before plugging it into the socket. The heating element will burn out immediately if it operates dry.
Combining a boiler with solar panels
More and more households use an electric boiler in combination with solar panels. This becomes even more attractive as net metering schemes are gradually phased out.
Advantages
Use self-generated electricity
Reduce energy fed back into the grid
Lower energy costs
Extra return from solar panels
A smart boiler or timer switch can help heat water mainly during daytime hours.
Keep maintenance in mind
Always install a boiler in a location where maintenance remains possible.
Allow sufficient space for:
Descaling
Replacing parts
Checking the anode
Inspecting connections
Manufacturers often specify minimum clearance distances around the appliance in their manuals.
Common mistakes during boiler installation
Avoid these common issues:
Electrical circuit too small
A boiler can consume a large amount of electricity. An overloaded circuit may cause malfunctions.
Plugging in too early
The plug may only be inserted once the boiler is completely filled with water. Connecting power before filling can cause malfunctions and leaks.
No pressure relief valve
Water expands during heating. Without proper discharge, leaks may occur.
Incorrect installation position
All boilers must be wall-mounted unless explicitly stated otherwise.
Not every boiler is suitable for horizontal installation. Always check the product specifications.
Poor pipe insulation
Uninsulated pipes lead to heat loss and higher energy consumption.
No maintenance space
A boiler installed too tightly makes maintenance difficult and more expensive.
Install it yourself or hire a professional?
Many electric boilers are relatively easy to install. All models are supplied complete with mounting brackets and an inlet combination valve.
However, professional installation is often recommended for:
Larger boilers
Modifications to the electrical panel
Installing new electrical circuits
Complex pipework
Combination with solar panels or central heating systems
Correct installation prevents malfunctions and often preserves the manufacturer’s warranty.
Looking for an installer? Visit our installer finder.
Tips for energy-efficient use after installation
After installation, you can save even more energy by:
Setting the temperature around 65°C
Insulating hot water pipes
Using a timer switch (for analogue boilers)
Using the SMART function (for smart boilers)
Performing regular maintenance
Limiting limescale formation
Modern boilers also feature improved insulation and smart energy functions that help minimise heat loss.
Safe and efficient hot water
A properly installed electric boiler provides comfortable hot water for many years with minimal malfunctions and lower energy consumption. By paying attention to safety, correct installation, and maintenance, you achieve maximum efficiency from your boiler.
Need help with installation or advice?
View our range of electric boilers or contact us for personal installation advice.