Full Title

Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters (steam boilers F22B) > Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium > in which the water is kept separate from the heating medium > by tubes, e.g. bent in serpentine form