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    Glow-Worm Ultimate System Boilers

    The average cost of a Glow-Worm Ultimate System Boiler is £820.00, which includes VAT and excludes installation.

    Glow-Worm Energy System Boilers

    A budget solution for homes with high hot water demands, the Glow-Worm Ultimate3 System is available in a 25kW output and must be used with a cylinder for storing hot water.

    The unit measures 740mm (H) x 418mm (W) x 300mm (D) and is designed to offer excellent reliability and heating performance. You’ll also be pleased to know that this high efficiency sealed system model complies with the latest ErP directive.

    The Ultimate3 System typically costs £820.00 which includes a 5-year parts and labour warranty only if the installation is registered on the Glow-Worm Club Energy programme by a Gas Safe installer.

    Boiler Energy Efficiency Credentials

    Glow-Worm’s Ultimate3 System is ErP A rated, which means it will help to reduce your energy bills as it’s one of the most energy efficient and environmentally friendly boilers on the market. The unit comes with a high-efficiency Grundfos modulating pump that can automatically adapt its output to match your heating and hot water requirements, which helps to lower running costs and maximise the amount of cash you save. If you want to improve efficiency levels, you can choose from a selection of optional controls including a Climastat room thermostat and the MiGo personal heating assistant.

    Ultimate3 System Technology and Main Advantages

    This competitively priced model features a user-friendly interface and bright LCD display to allow you to control temperatures and set heating and hot water on and off times, even when the appliance is sited in a poorly lit area. The boiler is also easy to install and maintain as most of the components are built into the unit itself and it even comes with an inbuilt filling loop.

    Glow-Worm has included a high-quality Grundfos pump, along with an automotive grade aluminium heat exchanger for reliable performance and to ensure the boiler remains quiet when in use. The Ultimate3 System is also compatible with a range of additional controls to offer you the ultimate in comfort, efficiency and convenience.

    Is the Glow-Worm Ultimate3 System the Right Boiler Type and Size for Your Home?

    When used in conjunction with a hot water storage cylinder (usually found in the airing cupboard), the Ultimate3 System is a great choice for small to medium-sized properties with more than one bathroom. The boiler doesn’t require a cold water tank in the loft as it draws directly from the water mains, making it ideal for homes with little or no loft space. Please be aware that this information is to be used as a rough guide, and you must ask a Gas Safe engineer to look at your home to determine whether this boiler can meet your needs.


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    A-rated combi boiler Save money on your gas bills
    Highly efficient Grundfos pumpMaximises efficiency and lowers running costs
    Automotive grade aluminium heat exchangerHighly efficient performance
    Clear LED displayDelivers clear visibility in poor light conditions
    Inbuilt filling loopLower maintenance costs
    Compatible with the full range of Glow-Worm controlsAlternative energy and cost saving options
    5-year parts and labour warranty when registered through Club EnergyConfidence and peace of mind

    Our Honest Opinion of the Glow-Worm Ultimate3 System

    The Glow-Worm Ultimate3 System is a flexible boiler that comes with a choice of top or rear mounted flue to enable you more choice over where the unit can be installed. It has been built specifically to work with a cylinder to suit more demanding medium to large households in need of a constant supply of hot water.

    There is only one heating output available, so it won’t be right for every home and is why you must get an engineer to assess your property and typical usage habits. You should also know that the unit is too big to be installed in a standard-size kitchen cupboard, so you’ll need an alternative storage space or cupboard if you prefer to keep your boiler hidden away.

    We like the fact that the Ultimate3 System has a Grundfos modulating pump to help reduce the amount of energy you waste and boost money savings. The aluminium heat exchanger is also a nice component as it ensures the appliance continues to perform well. Obviously, the price is a selling point as well, making this model one of the best system boiler options if your budget is tight.

    Advice on Boiler Quotes and Gas Safe Engineers

    Before you purchase the Glow-Worm Ultimate3 System, we recommend you shop around for a few quotes in order to compare prices and find the best boiler and installation deal. You also must make sure your chosen installer is Gas Safe registered and fully qualified to work on gas appliances. To check the qualifications and registration status of a professional, ask to view the details on their ID card or run a search at the Gas Safe Register website. If you haven’t the time to do the legwork, you can use our free online service to get no-obligation quotes from reputable suppliers and Gas Safe engineers in your local area.


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