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

    An update: Grant Technical Services emailed me back to confirm that there would be no problem feeding both coils in their DuoWave Indirect unvented Solar cylinder from the same heat source (i.e. a boiler). I must admit I was pleasantly surprised to get a reply as it wasnt a trade enquiry...
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    Can a dual coil cylinder be used with single heat source?

    Alec1, thanks for the quick response, this is reassuring to know. The Vaillant controller (VRC 470) has an NTC sensor (VR10) that fits in a dry pocket in the cylinder so it can accurately monitor the actual vs target temperature of the water in the cylinder so I would hope that this should help...
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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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