The boiler is the main providing source of heating in an underfloor heating system. The financial considerations of most boilers include the initial cost, installation and ongoing running fees.
Whilst the wet back boiler is a more dearer option, it is much effective to initially purchase an efficient and well-designed boiler than for service costs to continue accumulating over time.
The Wet Back Boiler
The two most commonly types of boilers are the dry and wet back. Wet back have steadily become more popular option as they are considerably more efficient and require far less maintenance. Though initially more expensive, they quickly prove cheaper in the long run.
The term ‘wet back’ comes from the fact that the reversal chamber is completely surrounded by water. This means the maximum amount of heat is conducted to the water, providing maximum efficiency. Dry back boilers do not completely cover the reversal chamber, lowering the efficiency as some of the heat is lost to the atmosphere.
Wetback Boiler Advantages:
They are more fuel/energy efficient
They can be set at a wide range of temperatures, with stable efficiency
They require little maintenance
They are cheaper to run
They last for decades
They have separate tube sheets between all major temperature changes
They are very tolerant of load changes
Any access door is constructed of durable material
Access doors require no cool-down period so they can be opened at any time
Efficiency is maintainable because hot gases cannot short circuit in a wetback design
Wet Back Boiler Installation
Wet Back boilers are now almost exclusively used for water heating in small to large housing. Their performance and durability outperform any of their rivals. Other boilers are however preferable in industrial applications.