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Glow-worm Energy 35 Store Combi

The Glow-worm Energy 35 Store Combi is a value for money gas boiler that is LPG compatible and designed for large homes.

If you have a large property and tend to use a lot of hot water on a daily basis, the Glow-worm Energy 35 Store will be able to handle your demands. It can provide an instant supply of unlimited hot water all by itself, meaning you don’t need to have a cylinder or any water tanks for it to keep up. Plus, this powerful boiler is suitable for homes that are either on or off the mains gas network because it is compatible with LPG straight out of the box.

How Much Does this Boiler Cost?

Glow-worm’s Energy 35 Store is a 35kW boiler with a flow rate of 19.7 litres per minute and a price tag of around £1,555 including VAT. If you’re wondering how much it will cost to install this boiler, we can tell you that prices vary greatly but usually start at £1,500. So, when you combine the price of the boiler with the fitting cost, you’ll be looking at spending a few thousand pounds. You may be able to save on these costs by shopping around and comparing quotes from different boiler companies and installers.

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

One of the major benefits of the Energy 35 Store Combi is that it’s a combination boiler, so you don’t need to find space for a hot water storage cylinder or cold water tank. It works by heating water directly from the mains, which means it heats the water instantly. Most combi boilers are recommended for homes with one bathroom but this particular model is designed specifically for larger properties with multiple bathrooms and high hot water requirements.

To find out if this boiler will satisfy the needs of your household, you will need to contact a Gas Safe registered engineer. A qualified heating engineer can advise you on the correct type and size (kW) of boiler for your home. If you pick a boiler that is too small or too big, it won’t run efficiently or it could make your fuels bill more expensive.

Is it a High Efficiency Boiler?

Yep. This robust boiler is ErP A-rated with an annual efficiency of 89.4%. It has also been endorsed by the Energy Saving Trust, so you’ll be getting a top-rated boiler that will not just save you money but reduce your carbon footprint as well. What’s more, the Energy 35 Store Combi is compatible with Glow-worm’s innovative Climapro2 RF wireless programmable room thermostat that enables the boiler to modulate so that it can manage your heating in the most efficient way possible.

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

The boiler comes with controls that let you adjust heating and hot water temperatures and has a reset button, system pressure gauge and on/off switch. It can be hung on a wall and features a mixing valve and shift load technology, as well as a stainless steel heat exchanger to ensure exceptional reliability and performance. This appliance even has two insulated integrated tanks to reduce heat loss and provide a constant supply of hot water. When it comes to water re-heat times, the Energy 35 Store takes less than 5 minutes.

How long is the Warranty on this Boiler?

This boiler comes with a 2-year parts and labour warranty as standard, but you’ll be offered anything up to 15 years if you get it installed by a Glow-worm Club Energy installer.

Energy 35 Store Combi Boiler Prices and Sizes

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
Energy 35 Store Combi 35CombiH – 890 mm
W – 470 mm
D – 561 mm
19.7 l/min35 kWA 90% and above£1555

Summary of Important Information

  • Expect to pay around £1,555
  • Heating output of 35kW
  • Hot water flow rates of 19.7 litres per minute
  • Dimensions of 890mm (H) x 470mm (W) x 561 (D)
  • Uses gas or LPG as its fuel source
  • A-rated for efficiency
  • 2-year warranty as standard

Pros and Cons

We are surprised that Glow-worm hasn’t been more generous with the standard guarantee, but you can extend this if you wish. Apart from this and the fact that the brand’s boilers don’t have a desirable Which? score, we think the Energy 35 Store Combi is an appealing option. Below, you can find all its pros and cons.


  • Suited to large homes with high hot water demands
  • No need for separate cylinder or loft tanks
  • LPG compatible without the need for a conversion kit
  • Easy to use and service
  • Ultra-quiet operation
  • Two 21 litre insulated tanks – provides a constant supply of hot water
  • Stainless steel heat exchanger – reliable performance
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions
  • Compatible with Glow-worm intelligent controls including the Climapro2 RF – allows you to customise heating and hot water times and manage the boiler using a handheld remote control


  • Glow-worm boilers have an overall Which? score of 54%
  • 2-year warranty – would prefer a longer standard guarantee
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