Modern log boilers provide clean and efficient heating, whilst utilising one of the most cost effective means of heating. Log boilers are suitable for all domestic-sized situations and for smaller commercial applications, such as country houses and small industrial buildings. They need careful consideration on larger applications where the physical requirement of splitting and loading the fuel can become time consuming.
Small domestic heating and light commercial
HDG R Series
The R range of log boilers are ideally suited to the smaller domestic dwelling. Purpose designed for simple and easy operation. Most commonly used linked with a fossil fuel (oil or gas) boiler.
Ideal entry level boiler for 2-3 bedroom property or highly insulated 3-4 bedroom house. 130 litre fuel chamber capacity (R20-30).
HDG F Series
Advanced commercially constructed log boiler.
HDG F Series 20,25,30
Suitable for a well insulated 3-4 bedroom house with average hot water demand. Ideal as the primary energy source.
HDG F Series 40-45-50
Suitable for an averagely insulated 3-4 bedroom house or well insulated 4-6 bedroom property with above average hot water demand. Ideal as the primary energy source for medium commercial application such as offices, larger shop or industrial unit. 195 litre fuel chamber capacity.
Larger domestic heating and commercial
Commercially constructed log boiler designed for both domestic and commercial applications. Scale liner is an option, 220 litre fuel chamber capacity. Lambda controlled for excellent efficiency. As a guide the Euro 30- 40-50 range of boilers might suit:
HDG Euro 30- 40
Well insulated 3-4 bedroom house with average hot water demand. Ideal as the primary energy source. Small to medium commercial application such as small shop specialist business unit.
HDG Euro 45-50
Averagely insulated 3-4 bedroom house or well insulated 4-6 bedroom property with above average hot water demand. Ideal as the primary energy source.
Commercially constructed log boiler for heavier load applications. Suitable for 1 meter logs with large fueling chamber. Lambda controlled for excellent efficiency: Suitable for larger country or urban properties. Large guest house or small hotel.
When choosing a log boiler, it is important to consider both its nominal output and fuel chamber size to ensure it is suitability. The nominal output of a boiler is the rate at which the energy stored in the wood is converted to heated water. It is important the nominal output of the boiler is at least matched to the property it is heating so as to ensure it can keep up with the rate at which heat is lost from the property. To ensure the boiler only requires loading and igniting once per day in average winter temperatures, it is important the fuel chamber is sized sufficiently.
To burn wood efficiently, there are two stages of combustion to be controlled - the burning of the volatile gases, and the burning of the fixed carbons (charcoal). The release of the wood gases is known as gasification, where the wood is partially burnt in the fuelling chamber and the gas released. The gas is then drawn into a separate combustion chamber where it mixes automatically with secondary air to burn completely in optimum conditions. The control of this two stage burning process requires boilers to incorporate intelligent combustion controllers, known as a Lambda sensor, to achieve the highest possible efficiencies. This sensor is situated in the flue way of the boiler and constantly monitors the flue gases and adjusts the primary and secondary air to ensure the boiler is always working to its maximum possible efficiency.
During the combustion process, more energy will be produced in the form of heated water than is required at the time by the heating system. This excess heated water is therefore transferred and stored into a highly insulated water tank, known as an accumulator. The high levels of insulation of these accumulators mean this energy can be stored for long periods until it is required for heating or hot water.
A number of options are available to make life with a log boiler that little bit easier. Automatic ignition systems enable the boiler to be loaded with fuel at a time of day that suits, with the boiler igniting automatically via an electrical ignition fan only when the heating system requires more energy. Fuel loading sensors inform the user of how much fuel to load into the boiler, based upon outside weather temperature and forecasted energy use.