Dunster Heat Limited, specialist wood boiler suppliers since 1990  
Contact us to discover how we can reduce your heating costs...
01984 640 656
Biomass heating system installers and suppliers of Vigas Boilers & Akvaterm Accumulators.
Dunster Heat Frequently Asked Questions
FAQ's about Biomass Heating... are few of the most frequently asked questions about biomass heating.

Q. Where should the boiler be situated?

A. In an outhouse or shed where your logs are (for convenience), Distance is not a problem, Dunster heats boiler is 45m away from the house.

Q. Does the boiler need dry wood?

A. Yes, the best wood to burn is at 20% moisture.

Q. How much wood does the boiler use?

A. For each 1 kW of boiler output rate – 0.4 tonnes of dry wood is needed per year.

Q. How many times a day do you need to load the boiler?

A. Twice in winter, first thing in the morning and last thing at night. When its warmer and not so much heat is needed you may only need to light it once every 3 days as the Akvaterm accumulator will keep the stored water warm.

Q. How long is the burn time?

A. Burn time is 4 hours, but the boiler will stay in slumber for at least 12 hours.

Q. Does the boiler need a chimney?

A. Yes. At least 5 metres.

Q. Are there grants available for this type of boiler?

A. Yes. Click here to see our grants & incentives information.

Q. Can I use a wood fuelled boiler in my house?

A. Wood fuelled boilers can be used in both the domestic home, country mansion and commercial or community premises.

Q. What size boilers will I need?

A. Rough guide for heat loads are as follows; domestic house 10-30kW, Farm house 30-50kW, mansion 75-150kW. Take a look at our Boiler sizing worksheet.

Q. Do you have a Plumbing Schematic?

A. Yes, click here.

Q. What does Carbon Neutral mean?

A. Carbon dioxide (Co2) taken from the atmosphere by trees during their growth - when they decay or are burned the (Co2) is released back into the atmosphere. In a managed woodland or energy crop the fuel burned is balanced with new planting so the crop is carbon neutral. Mature forests give off and use an equal amount of (Co2).

Q. What types of wood fuel are there?

A. Log, chip and pellet. The more handling the wood fuel is subjected to the higher the cost therefore logs have the lowest cost and pellet the highest. Pellets are made from compressed sawdust waste products and is approx. 8x25mm in size. Chip fuel if handled efficiently is the cheaper fuel per kW supplied (if comparing to oil and LPG). Chip is made from forestry thinnings and the chip must be of suitable quality.

© 2014 Dunster Heat Ltd. | Tel: 01984 640 656 | Email: | Company No: 07189269

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