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Glow-worm Ultimate3 Regular

The Glow-worm Ultimate3 Regular is a high-performance heat only boiler that can keep up with high hot water demand.

Glow-worm’s Ultimate3 Regular may be able to cope with high hot water demands, but it isn’t ideal for properties that don’t already have a traditional heating system. Available in an output of 25kW, the boiler has a sleek, modern design and is a good option for small to medium-sized dwellings. It’s a lightweight heat only gas boiler with kitchen cupboard fit dimensions and a range of features that will appeal to energy-conscious homeowners.

How Much Does this Boiler Cost?

You’ll need to pay roughly £830 if you decide to purchase this boiler, which comes in just one 25kW model. In addition to the upfront cost, you’ll also need to fork out for the installation. If you want our advice, you should shop around and get quotes from different installers to see if you can save on the boiler and fitting costs. By comparing prices, you could end up saving quite a bit of money.

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

Although compact, the Ultimate3 Regular still requires plenty of space because it needs a separate cold water tank in the loft and a hot water storage cylinder in the airing cupboard. This is why we said this boiler won’t be suitable for homes that don’t currently have a traditional heating system installed. Like most heat only boilers, it will continue to work at its best when a lot of hot water is being used from multiple taps or showers at the same time, making it perfect for properties with more than one bathroom.

We always advise that you consult a Gas Safe registered engineer prior to buying a new boiler, whether it be the Ultimate3 Regular or any other solution. A qualified engineer will need to assess your property and requirements to recommend the right boiler type and output for your home.

Is it a High Efficiency Boiler?

If you’re using an old inefficient boiler at the moment and choose to upgrade to the Ultimate3 Regular, you’re likely to notice a considerable drop in your energy bills. We can confidently say this because the boiler is A-rated for efficiency. But that’s not all. This boiler is also compatible with a range of efficiency-enhancing controls including programmable room thermostats and the MiGo personal heating assistant, but these are sold separately.

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

It has a fairly good range of controls and pretty much everything you would expect, such as an on and off switch, reset button and controls that let you adjust heating and hot water temperatures. Not forgetting that the boiler can be used with Glow-worm’s optional controls, like the MiGo app-based assistant that enables you to control your heating and hot water from a tablet or mobile phone. Some of the Ultimate3 Regular’s best features include the bright LCD display to make it easy to change settings in poorly lit areas and the high efficiency modulating Grundfos pump that can automatically adapt to meet demands. To ensure reliable performance, the boiler has a high-grade aluminium heat exchanger as well.

Glow-worm Ultimate3 Regular Boiler Prices and Sizes

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
Ultimate3 Regular 25RegularH – 600 mm
W – 375 mm
D – 280 mm
N/A25 kWA 90% and above£830

How long is the Warranty on this Boiler?

The Glow-worm Ultimate3 Regular comes with a 5-year parts and labour warranty as standard provided your Gas Safe registered installer registers the installation on the Club Energy installer loyalty programme.

Summary of Important Information

  • Expect to pay around £830
  • Heating output of 25kW
  • Dimensions of 600mm (H) x 375mm (W) x 280 (D)
  • Uses gas as its fuel source
  • A-rated for efficiency
  • Smart compatible
  • 5-year warranty as standard

Pros and Cons

According to a recent Which? survey, Glow-worm boilers have an average reliability record, so it might be wise to look at customer reviews to see what people have to say about the Ultimate3 Regular. Below are the pros and cons of choosing this boiler for your home.


  • Fits in a kitchen cupboard
  • Suited to small to medium-sized homes
  • Easy to use and service
  • Grundfos pump – reduces energy use and fuel bills
  • High-grade aluminium heat exchanger – reliable performance
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions
  • Compatible with a range of intelligent controls – improves efficiency and performance
  • Compatible with the MiGo app-based control – maximises efficiency, learns your energy needs and allows you to manage your heating and hot water from anywhere
  • 5-year warranty


  • Glow-worm boilers have an overall Which? score of 54%
  • Requires separate cylinder and loft tanks
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