I've fitted more twinflows than Drivel has had time to read about!
Feel free to explain how the Atag was wired and what made it quite unique in its choice of system boiler?
Once the two appliances were mounted onto the single frame, it became one appliance requiring it's own testing etc.
Oh, where by you live your sad little life in the Loony home through Google, I choose not to do drains but spend most days practicing as a register professional.
But then I have every right to, being a proper engineer!!!!
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