The pressure-resistant instantaneous water heater - hot water if required

The advantage of the water heater is that hot water can be generated directly at the tap, which firstly line losses are avoided and secondly no storage energy is needed. There are open (non-pressurized) and closed (flameproof) devices.

Operation of the pressureless instantaneous water heater

The open or pressureless water heater does not store water and therefore does not have to withstand the water pressure. However, it requires the installation of a suitable fitting, because this version requires three connections, cold water inlet to the tap, another cold water inlet to the water heater and the hot water supply to the tap.

If hot water is to be taken from the tapping point, the cold water is first led to the non-pressurized instantaneous water heater where it is heated and then forwarded to the tapping point via the hot water inlet. For example, with under-counter mounting devices are extremely short lines recorded.

The pressure-resistant instantaneous water heater

These devices store cold water directly in the water heater, so they must be properly designed to withstand the water pressure. Therefore, the name comes from pressure-resistant, the control is via the safety valves, which are mounted on the outlet.

There is a supply line for cold water in the unit and a hot water pipe leading from the unit to the extraction point. At the tap there are therefore only two lines, once the normal cold water supply without the detour via the water heater, on the other hand the hot water pipe between water heater and tap.

The pressure-resistant or closed water heater requires a more complex processing than the non-pressurized or open variant, since it must be designed for the corresponding water pressure. Therefore, it is slightly more expensive in the purchase price. On the other hand, it also offers the possibility to supply several taps.

In the course of the decentralized hot water supply one likes to use the efficient and inexpensive continuous flow heater. The fact that the pressure-resistant water heater can be connected to multiple tapping points, but not at each tapping point of the household a separate water heater must be connected, which in turn significantly reduces costs - at least in terms of cost.

Tips & Tricks

The pressure-resistant instantaneous water heater stores cold water as much as its capacity allows. In the event of pipe damage or damage to the container, water can flow out unhindered, which is why it is recommended that the water heater be completely emptied if there is a long absence, for example on vacation

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