Solar Hot Water Thermostat

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Solar Hot Water Thermostat

Postby astroboy » Thu Oct 13, 2016 1:11 pm

We have a solar hot water system located on the roof. The off peak hot water is only luke warm, can the thermostat be adjusted to increase the temperature? Where is the thermostat usually located?

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Re: Solar Hot Water Thermostat

Postby Gordon-Loomberah » Thu Oct 13, 2016 2:34 pm

You wouldn't normally adjust the thermostat to correct a newly developed luke warm water issue. Presumably you used to get hot water from your system? Are you sure the heating element is coming on for long enough to heat water in cloudy weather? The solar HWS should normally be enough to heat water in mostly sunny weather without the need for OP heating as well.
More information needed about what sort of system it is- does it have a tank on the roof, or remote from the solar collector - evacuated tubes or flate plate? Any timers or switches in the system that may be off or not functioning?

There will generally be a main thermostat in the hot water tank, which will govern whether or not any OP heating is required.
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Re: Solar Hot Water Thermostat

Postby astroboy » Thu Oct 13, 2016 4:31 pm

Thanks for the info. We have just moved into a new home. The hot water is hot during sunny periods, but is only warm at night and during cloud. The tank is on the roof, I don't think the heating element is heating sufficiently during cloudy weather or at night. I can't see any switches, only the main meter box, which has three smart meters. I don't have access to the system on the roof, as it is a two storey house. In our previous house, with gas hot water, we could adjust the heat at the tank.

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Re: Solar Hot Water Thermostat

Postby Gordon-Loomberah » Thu Oct 13, 2016 4:46 pm

Do you know if it is a close-coupled system with the tank joined to the panels/evacuated tubes, or is the tank separate and it uses a circulation pump?

You could have a look at the hot water meter and see how many kWh it accumulates overnight when you know the water temp is down, that will at least tell you if the heating element is coming on or not.
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