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    Can a dual coil cylinder be used with single heat source?

    This is my first post in this forum, but I have been lurking here for a couple of years as have previously found it to be a mine of useful information. My current system comprises a Vaillant ecoTec 637 (37kw) boiler with Vaillant eBus controls (VRC 470, VR61 2 zone centre, VR81) and a vented...
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