
7
Plumbing installation
Note following for installation
• Installations shall comply with the Danish Building Code and all other relevant regulations
and provisions, including those for electrical and water installations.
• Check all technical data and information on the type plate.
• Check that all accessories are removed from the packaging.
• Check that there is easy access to the hot water tank. Always install an external shut-off
valve for water supply to the heater.
• Flush all water pipes carefully before connection.
• Never expose the heater to water pressure exceeding 1 MPa (10 bar).
Installation can only be performed by an authorised plumbing/electrical installer, and in ac-
cordance with the Danish Building Code.
Approvals
VA no. 3.23/19559
Approved by DEMKO
Energy labels at www.METROTHERM.dk
Risk of corrosion
METRO THERM hot water tanks are made of enamelled steel, and protected by a magnesium
anode. If connections and pipes are copper or stainless steel, there can be risk of galvanic
corrosion at the point of connection. The risk can be mitigated by using a PEX pipe adapter
between tank and pipe installation.
The water heater is fitted with PEX bushings for cold and hot water supply pipes. These bush-
ings protect the enamel coating and must not be removed.
The water heater must be installed as a pressurised tank with shut-off, non-return and safety
valves, e.g. METRO safety device. The safety device must be positioned as shown in figure 2.
Using softened water in a METRO THERM tank
Water softened using salt can be used in a METRO THERM hot water tank. However, we
recommend removing the anode before the tank is used, to avoid degradation of the anode.
If the anode is degraded, the water can begin to smell, glasses in dishwashers can be stained
a milky-white and sulphur hydroxide can form, which cause the tank to begin to sputter.
Do not use demineralised water (double ion exchange), which will rapidly corrode the tank.
Demineralised water is also referred to as totally desalinated or deionised water.
1. Water supply (cold) 3/4” shut-off valve
2. Non-return valve (integrated)
3. Safety valve
4. Overflow 3/4”
5. Drain tap
B Hot water out 3/4”
C Cold water in 3/4”
Figure 2
CW
4
5
321
Hot water tank
Test pressure 13 bar
Operating pressure 10 bar