If you own a Solahart hot water system it’s important to change the anode every five years or so. To do this
- Close the cold water inlet valve.
- If the solar hot water system is connected to an electrical booster system, it may be wise to turn of electrical power.
- Release some hot water via the hot water relief valve. Hot relief valves come in different pressure ratings – so pick the right one.
- Remove the plastic cover in the centre of the the the storage tanks end cap – this may reveal some electrical connections for the booster heater.
- Carefully unscrew the anode. The storage tank could be under pressure, and the anode could be forced out at speed, so watch out. The anode is about the same length as the storage tank. So it’s a bit awkward to handle.
- Place new anode in storage tank and tighten it – watch out for cross threading.
- While working on the system you should also replace the hot relief valve. Do not replace a leaking pressure and temperature relief valve with one of a higher pressure rating as this may damage the water heater.
- Re-assemble end plate, open inlet valve & check for leaks
Hot relief valves can be ordered for around $60 on-line and Solahart quotes $120 for a replacement anode. Having Solarhart do the service is about $300. So there is a saving of around $100 for 15 minutes of work in this (prices Dec 2012). Of course there is some extra time involved in sourcing the materials!