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Old 16-03-2017, 04:53 AM   #126 (permalink)
Hugh Cow
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Here's my 10 cents worth. Silver soldering(brazing) copper to copper. Use 15% silver brazing rod and you dont need flux just make sure pipe is clean (use steel wool or equivalent scourer).

Air to water heat pumps: These are quite efficient but careful on the brand. They are basically an airconditioner on reverse cycle but cheaper ones don't last. they have an EER (energy efficiency ratio of 3 and above which means roughly 1 k/w of electricity for 3 k/w of heating.
https://www.daikin.com/products/ac/lineup/heat_pump/

You really need to heat the water to 70C to disinfect the water. Legionella and most other bacteria can survive in 60C (140F) water.
Legionnaire's Disease Outbreak Warning In North Thailand - Thailand News - Thailand Visa Forum by Thai Visa | The Nation

You need a thermostatic mixing valve to lower the temperature on the outlet of the tank which mixes cold water with 70C water which lowers the water temperature to prevent scalding.

An alternative is to use your existing airconditioning unit to make hot water, although it will only work while the A/C is running.
https://techcrunch.com/2011/06/12/ai...-water-heater/

I'm lazy so I would just have a solar electric panel installed. then I can just use a conventional electric hot water storage unit.
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