Gas fired water heater for room heating and production of hot water for domestic use

摘要

In known water heaters of the generic type, the circulating pump built into the return run has only one pressure connection and the reverse valve lying in the forward run for the "heating" and "domestic hot-water production" modes of operation is controlled by a motor-operated or electromagnetic auxiliary drive. A more simple and space-saving embodiment, which does without motor-operated or electromagnetic auxiliary drive, is produced if, according to the invention, the circulating pump (30) lying in the return run is provided in a manner known per se with two pressure connections (32, 34) and two fluidic valve elements (44, 60 or 82, 60) are provided, which respond only to flow forces and one (60) of which is connected in the forward run at the connection of a branch line (70) and the other (44 or 82) of which is connected in the return run between circulating pump (30) and heat exchanger (14). Preferred area of application is so-called "combined heaters", in which the heat exchanger (72) for the hot water for domestic use is built into the device, or so-called "boiler heaters" in combination with externally installed, indirectly heated hot-water storage tanks linked into the branch line (70). IMAGE