Lower water temperatures improve system efficiency but reduce the amount of heat available for transfer. Increased-depth coils overcome this by providing a larger heat exchanger surface area, allowing more heat to be extracted from the water without increasing flow temperatures.

In simple terms, deeper coils enable:

• Reliable heat output at lower water temperatures
• Improved system efficiency
• Better alignment with decarbonisation targets

BOSS™ Copperad offers a range of coil configurations to suit different heat sources and system designs:

Not every project has the wall space for a fan convector or unit heater. For these applications, our CT ceiling tile units bring the same low-temperature-ready performance to suspended ceiling grids.

The CT Solo Plus features an enhanced heat exchanger built for LTHW and heat pump systems, fitting standard 600 x 600mm ceiling grids without taking up floor or wall space. It’s a straightforward option for retrofit and refurbishment projects in schools, offices, and leisure centres, where wall-mounted heating simply isn’t practical.

When paired with high-efficiency EC motor-driven fans, increased-depth coils allow heating systems to operate closer to their optimum efficiency. This supports:

• Lower energy consumption
• Reduced running costs
• Improved system control and responsiveness

Rather than forcing the heat source to compensate, the emitter itself is optimised for low-temperature operation.

Operating at lower water temperatures with increased-depth coils can also help reduce temperature stratification, particularly in larger spaces. This results in:

• More even heat distribution
• Improved occupant comfort
• Reduced hot and cold spots

Across the Unit Heater, Fan Convector, and Ceiling Tile Fan Convector ranges, coil depth is selected to match the system temperature and application:

• 3-row coils are commonly used for low-temperature boiler systems
• 4-row coils are typically specified for heat pump applications
• The CT Solo Plus offers an enhanced heat exchanger for LTHW and heat pump systems in ceiling-mounted applications

To maintain safe and efficient operation, 4-row coils should not be used with conventional high-temperature boilers, as this can result in excessively high leaving air temperatures.

As low-temperature systems become the standard, coil selection is a key part of heating design. Increased-depth coils allow BOSS™ Copperad heaters, convectors, and ceiling units to deliver reliable, efficient performance in demanding environments, without compromising comfort or sustainability.

With flexible coil options, proven low-temperature performance, and robust construction, BOSS™ Copperad solutions are ready to support today’s projects and tomorrow’s energy standards.