Keston announced the launch of its Combi 2 and System 2 twin flue boiler range on 1 June 2023. The manufacturer said the range is suitable for both new and replacement heating systems and was developed for the residential and light commercial market1.
The twin flue system allows boilers to be sited up to 27m from the flue outlet, which Keston describes as greater flexibility for long or difficult flue runs1. The boilers carry a large, high resolution colour screen and a revised user interface, with four menu navigation buttons replacing the previous two-button arrangement so that engineers can scroll back through the menu during servicing1.
Keston lists several built-in efficiency features. An intelligent pre-heat function learns usage patterns based on 24-hour trends, which the manufacturer says gives occupants faster hot water while using less gas than a standard pre-heat function1. The range is also compatible with Halo wireless thermostats for smart control1. As with the rest of the Keston range, the new models can run on natural gas or a 20% hydrogen blend1.
"Keston is pleased to announce the launch of its new Combi 2 and System 2 twin flue boiler range"
The range is available with a warranty of up to seven years, which Keston describes as market leading1. Prices for the new models have not been reported.
| Feature | Detail |
|---|---|
| Flue siting distance | Up to 27m from flue outlet |
| Controls | Colour screen, four menu navigation buttons |
| Pre-heat | Intelligent, learns 24-hour usage trends |
| Thermostat compatibility | Halo wireless thermostats |
| Fuel | Natural gas or 20% hydrogen blend |
| Warranty | Up to seven years |
Why it matters for households
Flue position is one of the fixed constraints on where a boiler can go in a home. A twin flue system rated for runs up to 27m widens the choice of siting, which matters in flats, conversions and properties where the obvious external wall is not where the heating and hot water are needed1. For a household, that can mean the difference between a straightforward replacement and a more disruptive installation.
The hydrogen blend compatibility is a statement about fuel readiness rather than a change to how the boiler runs today. A 20% hydrogen blend is not the same as running on hydrogen, and the source does not say when or whether blended gas will be supplied to homes. Households on the gas grid would continue to use natural gas unless and until that changes.
The pre-heat function and thermostat compatibility sit in the same territory as any boiler's controls: they affect how much gas is used to keep hot water available, and how closely heating matches when a home is occupied. Warranty length is a factor in the long-run cost of ownership, though the terms behind the seven-year figure are not set out in the announcement1.
What happens next
No availability date, price or installer details for the Combi 2 and System 2 range have been reported. Households comparing options can read the Keston boilers range guide, or look at alternatives such as Vaillant, Baxi and Alpha in the boilers and heating section.