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FHT Stoves - Fan Heat Transfer Stoves - linking solid-fuel stoves directly to central heating circuits

Developed in response to a need for better control of the heat output from solid-fuel stoves

Providing better customer comfort, safer operation, lower installation costs and enhancing the contribution that wood burning stoves can make to reducing carbon emissions

Patented technology available to manufacturers to create products that will transform the stoves market

KinXerG Limited FHT Stoves is a trading name of KinXerG Ltd (Kin-Exergy) and covers all stove development activities within the company. KinXerG limited was formed by Simon Redford to develop new technologies for energy efficient and renewable heating systems and to provide consultancy services. Simon's recent background includes the development of micro CHP, heat pumps and other energy efficient technologies including pioneering voltage control techniques. He is the principal inventor or co-inventor of a range of technologies including innovations in solid fuel stoves, domestic voltage control, and various aspects of thermodynamic cycles. In addition to developing the FHT Stove technology, Simon is currently assisting a university department with the development of Organic Rankine Cycle (ORC) and Absorption thermodynamic cycles and has been advising clients about the use of voltage optimisation techniques as an energy efficiency measure.

Simon Redford's CV can be downloaded here.

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What inspired development of the FHT Stove?

"Necessity is the mother of invention", Plato (427 BC - 347 BC), The Republic

The FHT (Fan Heat Transfer) Stove technology was invented in response to personal need! Living in a rural community, wood burning stoves are not just desirable for comfort and efficiency, but also provide an essential back-up in the event of electricity supply failure. Faced with the replacement of an oversized, inefficient and poorly performing wood burning stove, Simon set out his specification for a replacement stove as follows:

- The ability to reliably control stove output without 'smouldering' the fire, tarring up the chimney and sooting the glass
- High efficiency, clean burning of wood to reduce costs and avoid waste and pollution
- The ability to distribute heat to other parts of the house as required
- Realistic installed costs

Not a lot to ask! However, like many people before him, he rapidly concluded that this specification could not be achieved with existing stove technologies. Inevitably he was directed to look at back boiler stoves but soon discovered that a dedicated, gravity fed radiator circuit was required to ensure safe operation; this required the heat to be dumped upstairs, the installation of wide bore pipes to ensure the gravity circulation (without a pump) and the majority of back boiler stoves could not work on pressurised circuits, so a header tank was required for the dedicated circuit. To link these radiators to his central heating system would have required converting the circuit to also have a header tank and the installation of a heat exchanger between the dedicated stove radiator circuit and the central heating circuit (such as a 'neutraliser' tank). Apart from the horrendous cost, installing header tanks was essentially impossible and the whole house would have required extensive modification and 'making good' to accommodate the new plumbing. If this wasn't enough, the back boiler is always 'on' when the fire is lit and the water jacket cools the firebox so that clean burning cannot be achieved and the stove and chimney are prone to tarring.


Like so many customers starting out with good intentions, Simon bought a high efficiency, clean burn stove with room output only and had to accept that comfortable burning could only be achieved on the coldest days. However, even during the recent very cold winters in the UK, with daytime temperatures below -10C, localised overheating occurred near the stove whilst the oil boiler worked overtime trying to keep the rest of the house warm.

There had to be a better way!

Given Simon's original specification and a considerable knowledge of developing domestic heating technologies, he set out to create a new technology. After eliminating various different ways of achieving his goals on the grounds of cost, absolute fail-safe operation, long life, etc, the FHT Stove design featured on this website was arrived at. However, careful design and extensive testing delivered far more than the original specification including:

- Fail-safe - water boiling cannot occur and there is a clear separation between the high temperature firebox components and the water circuit
- Direct, low cost connection straight into existing heating systems with no need for a dedicated stove radiator circuit and heat exchangers
- Works with either pressurised central heating systems (the 'norm' these days) or older, open-vented (header tank) systems
- Applicable to all designs of central heating system including 'combi' systems - although obviously the stove cannot heat potable water in such circuits
- The FHT Stove allows you to turn 'on' and 'off' the heat transfer, so that when heating a room from cold or on exceptionally cold days, all of the stove heat can be taken to the room, but when warm enough the excess heat can be diverted to other areas at the flick of a switch (or by a thermostat if preferred).
- The unparalleled control of heat output to the room allows the FHT Stove to lit for roughly twice as many days of the year than a simple stove, so extending the opportunity to save money on boiler fuel and reduce the carbon footprint of homes
- Ideal system for integration into low energy new build and refurbishment projects where stove heat requirements are lower and integration with thermal stores and/or under-floor heating systems is required
- Heat can be dispersed to any location via the FHT Stove pumped circuit rather than having to be 'dumped' in room directly above the stove

After around three years of development and testing, the FHT Stove system featured on this website is completed. Although simple in concept, considerable development has taken place to ensure safe, quiet and efficient operation, with long life components, without having to rely on flaps or dampers to provide safe operation. The FHT Stove is now ready for commercialisation and discussions are progressing with various stove manufacturers - why not email FHT Stoves (info@fhtstoves.com) if you would like to be one of the first customers to benefit from this technology?

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FHT Stoves is a trading name of KinXerG Limited
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