A poorly-designed chimney can lose a lot of heat ... ... A well-designed heat exchanger can recover it

Chimneys: those great brick/stone channels that drag the heat out of your house! If you are one of the few people who have the opportunity to build your own house, then please, please, put your chimney inside your house – even slap-bang in the middle of it! If you’re an architect, house design consultant (no doubt they exist somewhere?) or self-builder, then start designing houses around the chimney. So much heat/energy is lost up the chimney – more carbon waste that is needlessly sent into the atmosphere!

A good chimney, built inside the house, is not a fire hazard, in fact it can, with some knowledge, become a giant radiator or heat sink, which can provide the house with hours of warmth, long after the fire has gone out – the exact opposite of what the majority of chimneys in the UK currently achieve! Attach one of our insulated steel/clay chimneys to a Coppice Stove and you have one of the most efficient wood-burning systems in the world.

We would actively encourage architects, self-builders and others with an interest in house design to contact us to discuss our thinking on chimneys and the solutions, which we have to making chimneys provide warmth instead of losing it.
chimneys@redpigfarm.co.uk

Up to 50% of the heat that an ordinary woodstove generates is lost (forever) up the chimney. Insulating a chimney that is fixed to the outside of a house is wasting money. In some parts of Europe they refer to this British habit as “warming the birds.”

You will not find very many stoves in the UK that are fitted with chimney-based heat exchangers. We understand that not everyone can afford to go out and buy a Coppice Stove so; here is a fairly cost-efficient method to catch most of your heat before you blow it out of your chimney. These hot-air heat exchangers can effectively utilise the heat from the flue gas and thereby increase the efficiency of your stove by 40-50%, while reducing the temperature of flue gases.

This ‘simple’ exchanger is easy to install between chimney-pipe joints and comes in standard sizes.



BMWFHex 1: 2.5Kw (flue 130/150/160mm x diameter 320mm x height 330mm - CE (EN 1856-2) : £135.00

BMWFHex 2: 5.0Kw (flue 130/150/160mm x diameter 320mm x height 500mm - CE (EN 1856-2) : £185.00

BMWFHex 3: 2.5Kw (flue 180mm x diameter 350mm x height 500mm - CE (EN 1856-2) : £160.00

In the Czech Republic these lightweight steel chimney exchangers are called “Cret” (Devil)! We suppose that this has something to do with heat? This lightweight steel chimney exchanger is a slightly cheaper version of the heavier exchangers described above, but, nonetheless as effective when it comes to grabbing heat from your chimney and blowing it back into the your room.

BMWFDLK: (available as 130mm and 160mm diameters. Other sizes available - please ask) : £85.00

All prices include VAT & Delivery.

Order your Heat Exchanger here: