Combination wood and oil boilers, often called multifuel boilers, are generally considered more fuel-efficient than boilers that only use one kind of fuel, because they produce less waste and have a higher boiler efficiency. Multifuel boilers can save you money, as well. When the price rises on one fuel, you can switch to the other fuel. Some models need only one chimney flue, so they are easily installed in houses that already have a built-in flue (there is no need to add another).
Benjamin Furnace CC500
The Benjamin brand CC500 furnace is a combination wood and oil water boiler. The wood combustion chamber is oval-shaped to increase fuel efficiency and to eliminate the need for wood or firebrick grates. This chamber is located above the oil chamber, which makes it easier to clean. It is designed so that you can easily switch the combustion chamber out with a new chamber without replacing the entire unit when the original eventually wears out. The CC500 also features a cast-iron door for a tighter seal and hand welding. The firebox is surrounded by a cooling water heat exchange medium, which prevents the unit from overheating.
HS Tarm Excel
The Danish company HS Tarm makes a multifuel boiler called the Excel. The boiler has two chambers, one for wood and the other for fossil fuel. The HS Tarm Excel can also use propane or natural gas. The separate combustion chambers allow for more safety and more fuel efficiency. The exhaust from both chambers uses the same chimney flue, so there is no need to install two flues. Also, the Excel automatically switches from wood to oil, so, if you are not there to add wood, the boiler does not shut down--it simply switches to the other fuel.
CTC Series 280 Gemini Plus
The Swedish company CTC makes a multifuel boiler capable of using oil, gas, wood and other solid fuels. The Series 280 Gemini Plus has longer-than-average gas channels, which maximise the unit's efficiency. It is also possible to adjust the flue length, which means you can adjust the output. The boiler comes in three sizes, holds a large amount of water and is whisper-quiet, according to the company's official product sheet. It also has a specially designed low NOx combustion chamber to keep emissions down.
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