Sirena HFDE

SIRENA HFDe 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 with wattages of 29, 40 or 52 kW, or heating + domestic hot water with wattages of 29 or 40 kW. The heating only version is equipped with all the hydraulic and electric sockets required for connection to a domestic hot water tank.

Its functioning is totally electronic, and its special design makes operation user-friendly.

Modulating domestic hot water production
The boilers in this range are equipped with an electronic system that modulates the DHW circulating pump to stabilise the consumption temperature regardless of the water flow required and the boiler inlet water temperature. This means the boiler can work at a low room temperature and lower fume temperatures, and makes better use of the latent heat of the combustion fumes.

Easy installation
This range is specially designed for quick, easy installation and is fully kitted out on supply. Equipment includes a non-membrane flow switch, dual pump system and automatic dual safety drain valves.

Safety
The products have numerous systems to ensure correct functioning and a long lifetime (“no water” safety, pump block, anti-inertia, anti-frost, legionnaire’s disease prevention, etc.)

E20 remote control option
This range includes optional connection to an E20 remote control for programming functioning times, obtaining the desired temperature at all times and remote access to information on any boiler alarms triggered.