Introduction:
In recent years, stricter regulations for solid fuel boat stoves have prompted many boat owners to consider alternative options. One such option are diesel stoves. As a result, we are witnessing an increasing number of diesel stove installations that utilize existing flue parts from the previous solid fuel setups. However, it’s essential to understand that solid fuel flue chimneys and cowls are not necessarily suitable for diesel stoves. In this article, we will explore the reasons behind this incompatibility. We will also discuss the importance of anti-downdraft cowls for marine diesel stoves.
For quotes and bookings contact us on 07846 274 926 or email [email protected]
For more general information on flues for boat stove installations, please read our blog post on The Benefits Of Stainless Steel Twin Wall Insulated Flues.
Regulatory Changes and the Shift to Diesel Stoves
Due to environmental concerns and new regulations, the use of solid fuel stoves is becoming more restricted in many regions. Smoke-controlled zones are now very common. They still allow DEFRA approved solid fuel boat stoves. However, we are also already hearing of some London boroughs attempting to prohibit all solid fuel boat stoves. They aim to restrict the emitting of any smoke from a boat stove flue.
One of the alternatives that boat owners often turn to are diesel stoves. These offer an efficient and reliable heating solution while being less polluting and not emitting any visible smoke. However, when installing a diesel stove using the existing solid fuel flue, certain considerations must be taken into account.
The Differences Between Solid Fuel and Diesel Stoves
Solid fuel boat stoves typically require a simple flue cowl with a simple hat to keep out rainwater. Such cowls are non-restrictive and encourage the upward flow of combustion gases. Downdraft protection is not necessary for solid fuel boat stoves, as they burn much hotter with an amber bed. Downdraft is therefore less likely to occur, and when it does it does not extinguish the fire.
On the other hand, marine diesel stoves function differently, requiring downdraft cowls to protect against strong crosswinds. Diesel vapourising burners work with a thin layer of fuel in the bottom of the burner pot. Because the burner pot is hot, it vapourises the fuel. It is this vapour that burns. Without an anti-downdraft cowl fitted, strong crosswinds can enter the flue and easily extinguish the flame. Many marine diesel stoves are not fitted with thermocouples that stop the fuel flow if the flame goes out. If a downdraft extinguishes the flame, fuel will keep flowing into the burner pot. This will eventually cause it to overflow. Then, fuel will enter the cabin, the bilges, etc.
Understanding Downdraft Cowls for Marine Diesel Stoves
Downdraft cowls are usually part of a flue system. This system is specifically designed by the manufacturer for the stove being fitted. Though retrofitting is possible, it may not be as effective. We recommend boat owners always use qualified installers who utilise flue parts specifically recommended by the manufacturer. Often there will be different anti-downdraft cowls available depending on the type and location of the boat. For example, an inland waterway vessel will be exposed to less extreme conditions than a boat going to sea.
Conclusion
Boat owners seek alternative heating solutions due to more stringent solid fuel regulations. Marine diesel stoves have gained popularity due to their efficiency, reliability, and compliance with stricter regulations. However, when retrofitting a diesel boat stove, it is crucial to use manufacturer-recommended flue parts. Ensure you install these parts with the appropriate anti-downdraft cowl. By understanding these requirements, boat owners can ensure the safe and efficient operation of their diesel boat stoves.
For quotes and bookings contact us on 07846 274 926 or email [email protected]