Gravity Feed low pressure,Solar Hot Water systems?

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Re: Gravity Feed low pressure,Solar Hot Water systems?

Postby BlueSky » Fri Jul 30, 2010 1:36 pm

I still havnt sorted my hot water out yet and havnt really found a very good solution either...this sounds good...do you have any links to where you have found them at a good price? cheers
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Re: Gravity Feed low pressure,Solar Hot Water systems?

Postby jdaley » Sun Feb 26, 2017 2:49 pm

John Daley
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Re: Gravity Feed low pressure,Solar Hot Water systems?

Postby John1970 » Mon Mar 13, 2017 8:03 am

I have an 'Ultimate solar' unit that is probably two years old, low pressure and you can connect a wood heater to them too. Only problem I've had was the off peak Electric boost Thermostat packing it in and kept heating! Think its maybe a bad design? I changed the mounts on mine to get a better winter angle but its not needed as I found out. I've seen it boil water on a clear day at 11*C as long as it gets sun it works.
https://youtu.be/0PUPM7ZJJYI
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Re: Gravity Feed low pressure,Solar Hot Water systems?

Postby jdaley » Mon Mar 13, 2017 3:15 pm

The thermostat issue seems strange, but of course that is not a normal operating part of the solar system, so its faults can be separately dealt with.
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Re: Gravity Feed low pressure,Solar Hot Water systems?

Postby John1970 » Tue Mar 14, 2017 10:20 pm

The thermostat is one of the tube or rod types, was replaced under warranty. Never had a problem with the old electric HWS, set at 60*C for years but the cost was getting to much even on a dedicated off peak circuit :o
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Re: Gravity Feed low pressure,Solar Hot Water systems?

Postby jdaley » Tue Mar 14, 2017 10:32 pm

What about dropping the thermostat out and switching to LPG either over winter or as a backup through the circuit. Here in the Wellsford Forest, out of Bendigo, I cut HWS from my panels when the tank temp drops below 37 degrees for a week, meaning winter has come and use an old LPG heater, then I monitor a temp gauge in the bathroom until the solar picks up regularly again and I switch back to the solar system.
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Re: Gravity Feed low pressure,Solar Hot Water systems?

Postby John1970 » Wed Mar 15, 2017 8:18 am

There are only a couple of weeks worth of days lacking in solar that need to be boosted so I haven't bothered, I could hook it up to the SC stove if I put in a heat exchanger on the fire. The HWS is plumbed for this, just need the insulated 3/4 inch copper pipes etc ( If I had the spare time and parts I probably would hook it up.)
If I get a couple of hours of sun per day this is usually enough to keep the water between 40 and 60*C
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