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Old 11-24-14, 04:34 PM   #1
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Default retrofit coils

Hi all,

I currently have a 30 tube 300 litre solar water heater, with integrated horizontal tank. I want to put a coil into this and put mains pressure cold water in one end, and get lovely piping hot out of the other end. Does anyone have a supplier that does finned flexible 15mm (1/2") copper or stainless steel pipe that I can cut into my tank. It is in 3 internal sections, with a 15mm pipe between each, so seriously limits my original plan of using a Plate Heat Exchanger, as no matter what size I try, I cannot flow the store water fast enough to get a decent flow of mains hot to the taps.


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Old 12-01-14, 11:48 PM   #2
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Default sources

Check out these links:

Convoluted Copper (25' x 5/8" No Fittings) | MoreBeer

Bottom of page on this one:
Heat Exchanger manufacturer-exporter China

Evaporator Manufacturer Titanium Cooling Coil - Buy Titanium Cooling Coil,Refrigerator Evaporator Coil,Chilled Water Cooling Coil Product on

Solar Metal Flex | Storage tank

DONG-A-Flexible Tube & Fitting for heat exchanger (MODEL-006) - Serpentine Coil Tubing

coaxial heat exchanger inner tube -

Happy hunting!

Last edited by jeff5may; 12-02-14 at 12:08 AM..
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Old 12-10-14, 07:00 PM   #3
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Default Just a thought..

If you are not getting enough pressure running your domestic hot water thru your solar tank, could you possibly turn that solar tank into a closed loop system and run that hot water into the house and thru a solar hot water heater with heat exchanger inside the tank?

The solar hot water heater could have an electric back up heating element to maintain temp on cloudy days.

or, you could run it thru a similar tank in the house to preheat the water entering your existing hot water heater.

just some thoughts..
You'd of course have to run glycol thru the system to prevent freezing but it beats tearing apart a perfectly good stainless steel tank to insert a coil.

Pat from Warwick, RI

Please Note:
Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by 'the seat of my pants'
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