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Posted By: qeiplThe maximum available flow rate through a 15mm pipe is around 20 litres/minute (measuring jug under the kitchen tap at full bore), which an online calculator converted to 43l/m for the 22mm pipe.
Posted By: qeipl I had managed to work out the power required to heat the water but I was sceptical of my calculation of the heat transfer between the water in the tank and the water going through the coil. I'll follow advice and search for advertised ratings but as a matter of interest do you know how to calculate the heat transfer from tank to DHW via a coil?
I was sceptical of my calculation of the heat transfer between the water in the tank and the water going through the coil.
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