Electric Combi Boiler Prices | 2023 Buying Guide

Jul 31, 2023 Blog, combi boiler
Electric Combi Boiler Prices

An electric combi boiler is a type of boiler that uses electricity to heat water. It is often confused with a regular electric water heater, but it’s actually a much different system. Both types of boilers offer several benefits over gas or oil-fired heaters, including lower installation costs and better efficiency (in some cases).

What is an electric combi boiler?

An electric combi boiler is a heating system that provides both central heating and hot water supply in one compact unit, using electricity as the power source instead of gas.

It operates by heating water that flows through it, either via a heating element or a magnetic induction unit, and then delivers the hot water to taps and radiators for heating throughout the home. Electric combi boilers are generally smaller, quieter, and easier to install than gas boilers, and do not require a separate gas supply, making them a desirable option for homes without access to a gas line.

How does an electric combi boiler work?

The electric combi boiler heats water directly through an electric element, similar to an electric kettle. When you turn on the hot water tap or need heating, cold water from the mains enters the boiler, and the electric element heats it up. Then, the hot water is sent to your taps or radiators, giving you instant access to hot water and heating without the need for a storage tank.

electric combi boiler cost

Advantages and disadvantages of electric combi boiler


  • No need for a gas supply, making it suitable for properties without a gas connection.
  • Compact size, ideal for smaller homes or places with limited space.
  • Quick heating, providing hot water on demand, which means no waiting for a storage tank to refill.
  • Reduced carbon footprint, as it doesn’t burn fossil fuels directly.


  • Higher electricity rates might lead to higher operating costs compared to gas boilers.
  • Limited hot water flow rate, which might not be sufficient for larger households.
  • Dependency on electricity, which could be an issue during power outages.

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How to install electric combi boiler?

  • Turn off the power supply to your boiler and make sure it’s safe to work on.
  • Remove the old boiler, along with its flue and venting system (if applicable).
  • Inspect your existing flue and venting system for any damage or obstructions; if there are any cracks in the pipework, they should be repaired before installing a new boiler as this could lead to carbon monoxide leaks into your home.
  • Connect up your new combi electric heating system by attaching gas pipes from its main control valve (located at base of unit) directly onto an existing gas supply pipe coming from outside wall or floorboards – don’t forget about isolating valves too! Then connect electricity cables from main electrical box (which houses fuses etc) directly onto switchboard – again, don’t forget about isolating switches! Finally connect additional wiring required for optional extras such as programmer/timer controller etc…

How much is the electric combi boiler?

electric combi boiler price

An electric combi boiler typically costs between $1,500 and $6,500 to install, with an average cost of $4,000. This cost generally includes the boiler unit itself, installation costs, and any additional parts such as pipework, electrical wiring, and controls. However, the actual cost of installation may vary depending on factors such as the size of the unit, the complexity of the installation, and the location of the property.

Size (BTU) Efficiency (%) Price Range ($)
10,000 95% $1,500 – $2,000
20,000 90% $1,800 – $2,500
30,000 88% $2,000 – $3,000
40,000 85% $2,200 – $3,500
50,000 82% $2,500 – $4,000
60,000 80% $2,800 – $4,500

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Operating cost of electric combi boiler

The operating cost of an electric combi boiler depends on several factors, including the electricity rates in your area, the size and efficiency of the boiler, and your usage patterns. Let’s break down the key factors that contribute to the operating cost:

  1. Electricity Rates: The primary factor influencing the operating cost is the price you pay for electricity per kilowatt-hour (kWh). Higher electricity rates will result in higher operating costs for your electric combi boiler.
  2. Boiler Size and Efficiency: The size of the boiler and its efficiency rating play a significant role in determining how much electricity it consumes to heat water and provide heating. A larger and less efficient boiler may consume more electricity, leading to higher operating costs.
  3. Usage Patterns: Your usage patterns also affect the operating cost. If you use hot water and heating frequently, your electric combi boiler will work more often, increasing the electricity consumption and subsequently the operating cost.
  4. Insulation and Home Efficiency: The overall insulation and energy efficiency of your home impact how much heat your electric combi boiler needs to produce to maintain a comfortable temperature. A well-insulated and energy-efficient home may require less heating, reducing the operating cost.
  5. Climate: In colder climates, the electric combi boiler might need to work harder to maintain the desired temperature, leading to increased energy consumption and operating costs.

The operating cost of an electric combi boiler depends on several factors, including the size of the boiler, the kW output, and usage patterns, as well as the cost of electricity in your area. On average, electric boilers use around 10 kWh of electricity per hour when they are running, which accumulates into around 100 kWh per day, and 3,000 kWh per month assuming that you leave the electric boiler running for ten hours a day, every day of the cold months.

According to e3sustainable, in the US, the average cost of electricity as of July 2021 was about 13.19 cents/kWh. Therefore, operating an electric combi boiler for ten hours per day, every day for a month would cost around $395 (3000 kWh x 13.19 cents/kWh).

Comparison of Electric Combi Boiler and Gas Boiler

Electric Boiler vs Gas Boiler

  • Cost: Gas boilers are generally cheaper to purchase and install compared to electric combi boilers. However, the overall costs can vary depending on factors such as the size of the unit, installation requirements, and the availability and price of natural gas or electricity in your area.
  • Efficiency: Electric combi boilers tend to have higher efficiency ratings compared to gas boilers. Electric boilers have efficiency ratings above 90%, while gas boilers typically have efficiency ratings ranging from 80% to 98% depending on the model and type.
  • Fuel Availability: Gas boilers rely on a natural gas supply, which may not be available in all areas or might require additional infrastructure for installation. Electric boilers, on the other hand, can be installed anywhere with access to an electrical power supply.
  • Environmental Impact: Gas boilers produce emissions during combustion, mainly carbon dioxide (CO2) and other pollutants. Electric boilers have no direct emissions during operation, making them a cleaner option. However, the environmental impact depends on the source of electricity generation in your area.
  • Maintenance: Electric combi boilers generally require less maintenance compared to gas boilers. Electric boilers have fewer moving parts, which means there are fewer components that need regular servicing or repair.
  • Energy Costs: The cost of operating a gas boiler is generally lower compared to an electric boiler due to the lower cost of natural gas compared to electricity. However, the cost of both fuel types can vary based on regional factors and market fluctuations.

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In conclusion, electric combi boilers present a remarkable solution for eco-conscious homeowners seeking efficient heating and hot water provision. Their space-saving design, energy efficiency, and installation flexibility make them an increasingly popular choice. Understanding how electric combi boilers work and optimizing their performance through proper maintenance and usage can ensure a reliable and cost-effective heating system for your home.


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