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We had a 250 liter tempest twin coil solar, and the plumber just used the bottom coil. Can you tell me where this direct instruction of the manufacturers is. Was it in the installation guide?

I have a tempest twin coil solar (250l). Our plumber only connected the bottom coil to the boiler and we nothing connected to the upper coil. You say that there was a direct instruction of the manufacturer to link the output from the top coil to the input of the bottom coil. I had a look at...