So @ what temperature is the water stored?
What are the dimensions of this custom made cylinder? 950 by 450
What is the surface area of mains fed coil? 160,000 mm²
What is the surface area of primary heating coil? not known
You had this custom made so the specifications should be at hand or something you wouldn't forget in a hurry. that was just one of many things to do before moving in and memory got overloaded
BTW most manufactures recommend a minimum thermal store temp of 75c.
Temperature of the hot water is 65.5°C ( it is not a thermal store )
Flow rate at the shower hot is 7.5 ltr per minute
The calculated external surface area of the mains fed coil is 160,000 mm² and this was achieved by forming the coil with 6.5 metres of 8 mm diameter pipe.
The error was that the size of the secondary coil significantly reduced the volune of water in the cylinder.
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