Biomass Wood Chip Fuel Specialists
Call us: 03301 232 014

The Best Return on Investment

A heat meter is a bank account – make it work.

Chip Chip Ensures optimum 90% Efficiency or above at 4 pence per kW /h meets the design criteria for high performance biomass boilers and ensures low maintenance, low ash and optimal heat output.

Fuel at 35% moisture content.

Boiler running 65% efficiency at 5.23 pence per kw/h, the boiler will require more maintenance and manual intervention as well as using around 25% more fuel and is unlikely to generate the same RHI earnings.


Fuel at 50% moisture content and above.

Boiler running 55% Efficiency at 5.7 pence per kW /h requires around twice as much wood fuel and may not achieve the same RHI earnings.

Boiler Efficiency V Moisture 


The costs below are shown as both ‘input’ prices – i.e. the cost of the fuel before the inefficiency of the boiler, and the output price.

Most correctly commissioned wood fuel boilers are typically 85-90% efficient, however its vital that correct fuel is used to attain such high boiler performance. The cost of heat ‘on the meter’ (after the inefficiencies of the boiler) will be the cost shown below divided by the efficiency of the boiler.


• 50% wet fuel at 3.13p per kWh, equivalent to £70 a tonne, with a calorific value of 2240kWhrs/t.

Based on 55% efficiency – real price of 5.7p per kWh.

• 35% wet and or contaminated fuel at 3.4p per kWh, equivalent to £105 a tonne, with a calorific value of 3100kWhrs/t.

Based on 65% efficiency – real price of 5.2p per kWh.

• 20% of clean virgin wood chip at 3.62p per kWh, equivalent to £145 a tonne, with a calorific value of 4000kWhrs/t.

Based on 90% efficiency – real price of 4.02p per kWh.


Note: prices can vary from supplier to supplier. Quantities and final purchase price may be effected by regional market forces.

Please ask Chip Chip for a specific quotation.



Wood fuel quality is similar to the MPG of a car. The wetter the fuel – the less 'mileage' can be extracted and so more of it needs to be purchased. In simple terms, Fuel Consumption goes up.


If the boiler is running at 50% efficiency due to poor quality, wet and/or contaminated fuel, it will use twice as much wood fuel to achieve the same RHI.


For example, a 205kW biomass boiler running 3000hrs per annum should generate around 615,000kWhrs/yr. However, if poor quality, wet (40% moisture content and above) and or contaminated fuel is used, then the efficiency and output can drop dramatically, in some cases by as much as 50% if the boiler isn’t designed to run on high moisture content fuel. At the very least, more fuel will be required and at worst valuable RHI payments will be effected and maintenance bills will soar.


ChipChip – getting the best out of biomass


Most people make sure they are getting the highest bank interest rates and are

paying the lowest tax...but fewer people check their boiler performance to make sure its running at the highest efficiency.


Using wet and inadequate fuel will;

Affect and reduce your RHI payments as your meter will not be registering the heat generated

that it should be and fuel consumption (measured by the tonne) will increase.

Net Effect

> more fuel used

> more deliveries & disruption

> more maintenance

> less RHI income earned


Burn less – get more

205kW x 3000hrs = 615,000kWhrs

RHI Payments* = 1314hrs x 205kW x 5.18p = £13,953.37 plus 1686hrs x 205kW x 2.24p = £7,742.11.

Total RHI Payments = £21,695.48/yr


Chip Chip fuel – 615,000kWhrs divided by 4000kWhrs (calorific value of Chip Chip fuel) = 153.7 tonnes/yr

Wet fuel at 45% moisture content – 615,000 divided by 2540kWhrs (the calorific value of poor quality fuel) = 242 tonnes.

(This assumes the same boiler efficiency. In reality, boilers using wetter fuel are likely to be less efficient and so will actually use even more fuel).


Saving over 90 tonnes of fuel per year.