SIRENA HFD is a range of boilers with cast iron heat exchangers and high combustion performance, in excess of 93% of the LHV.
The range consists of 2 versions, heating only and heating + domestic hot water, with wattages of 29 or 40 kW. The heating only version is equipped with the hydraulic and electric sockets required for connection to a domestic hot water tank.
This range is specially designed for quick, easy installation and is fully kitted out on supply. Equipment includes a non-membrane flow switch, an expansion tank and automatic dual safety drain valves.
DUAL PUMP SYSTEM
The boiler includes a hydraulic dual pump circuit and a powerful heat exchanger, and can supply up to 17.8 litres or 22 litres of domestic hot water per minute (depending on the version), with a 30ºC temperature increase.
80 MM DIAMETER FORCED DRAUGHT GAS REMOVAL
The special burner design allows the boiler to be installed with an 80 mm insulation-free gas outlet system, even with horizontal sections of piping, which can mean major savings on installation costs.