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Posts: 0
Reply with quote  #1 
I live in Singapore. Thinking of starting a diy water solar project to supply free hot water to my washing machine.

I am thinking of putting together an parallel array of stainless steel pipes or copper pipes without any insulation or pump. The array of pipes will be placed horizontally on my roof, which is flat. Cement will be used to secure the array. (I am concerned about leaking roof if I drill into the roof)

Tap -----> array of pipes -----> washing machine

Definitely lots of stagnation. To get the most heated water, I can time the washing machine to run at 3pm.

Will the pipes be able to take the heat and the pressure? My tap water is 1.8 bar

Thanks a lot!


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Posts: 2,952
Reply with quote  #2 
As long as there is NO check valve in the system the pressure in the collector will equalize with the rest of the plumbing, so you shouldn't have a problem.
Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay

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Posts: 1,074
Reply with quote  #3 
If the piping in your collector won't supply enough volume you might look a batch water heater instead.


Both temperature rise and airflow are integral to comparing hot air collectors
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