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Main Eco Compact System Boiler

The Main Eco Compact System is better suited to homes with a high demand for hot water.

Compact and lightweight, the Main Eco Compact System is a gas-fired condensing boiler that’s easy to install and features ‘cupboard fit’ dimensions and simple user controls. It looks modern, has a good warranty and comes in a choice of outputs to satisfy different heating and hot water needs. The boiler is also energy efficient and produces low NOx emissions, which means it will be kind to not only your wallet but also the environment.

How Much Does this Boiler Cost?

The Main Eco Compact System typically costs between £620 and £700 including VAT, making it a good choice if you have a lower budget. You need to pay for the installation as well, and this can cost anything from £500 to £1,600. If you get a fixed-price quote from a range of local and national installers, you can compare prices and find a competitive deal on the boiler and the fitting work.

How will I know if this Boiler is Suitable for My Home?

Although the perfect for choice for homes with high hot water demand, the Main Eco Compact System requires additional space as it needs to be installed alongside a hot water storage cylinder. By storing hot water in a cylinder, this boiler can deliver a constant supply of hot water to multiple taps, baths and showers that are running at the same time, so it’s also perfect for homes with more than one bathroom.

There are two models to choose from in the Main Eco Compact System range, including 15kW and 18kW, and you must pick the size that best fits your heating and hot water requirements. For expert help and advice on choosing the correct size boiler for your home, get in touch with a trusted Gas Safe registered engineer.

Is it a High Efficiency Boiler?

The Eco Compact System has an A efficiency rating for heating and hot water and should help to save you some money on your gas bills. It’s also Boiler Plus compliant and an Energy Saving Trust endorsed product, which should give you confidence that the boiler is highly efficient and kinder to the environment. Furthermore, this boiler is designed for ultra-low emissions and has a class 5 rating for low NOx emissions.

Does this Boiler have a Good Range of Controls and Features?

This boiler’s front panel features a set of simple controls, such as a digital display, reset button, central heating temperature control, service diagnostic port and system water pressure gauge. It has a top central flue, brass hydraulics block and an optional stand-off frame too. The Main Eco Compact System has front access to all components to make installation and servicing easy for you engineer and it can be used with various models of room thermostats.

How long is the Warranty on this Boiler?

No matter whether you choose the 15kW or 18kW model, your Main Eco Compact System comes with a 5-year parts and labour warranty as standard.

Summary of Important Information

  • Expect to pay between £620 and £700
  • Heating output of 15kW or 18kW
  • Dimensions of 700mm (H) x 390mm (W) x 285mm (D)
  • Uses gas as its fuel source
  • A-rated for efficiency
  • 5-year warranty as standard

Pros and Cons

If you’re looking for a reliable no-frills boiler with high efficiency and the ability to meet your high hot water demand, the Main Eco Compact System might be a good choice for you. Just be aware that Main has a below-average Which? brand score, meaning the test results reveal that it isn’t the best budget brand out there at the moment. Keep scrolling to read our full list of pros and cons.


  • Considerably cheaper than some other gas boiler brands
  • Suited to small and medium-sized homes
  • Can handle high hot water demand with ease
  • Compact cupboard fit
  • Easy to install, use and service
  • Boiler Plus compliant and Energy Saving Trust endorsed
  • Low NOx emissions – rated class 5
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions 
  • 5-year warranty


  • Main has an overall Which? score of 48%
  • Requires separate cylinder
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