Hi,
The VAT liability of the supply of solar power diverters will qualify to be zero-rated in Great Britain ( England, Wales and Scotland) when they are supplied and installed ( as a single supply) between the period 1/4/22 to 31/3/27.
The supply would qualify to be zero-rated under Item 1(a), Group 2, Schedule 7A, VATA 1994 when made by your business to a persons private residential address in Great Britain.
The functionality of the Solar power diverters as described in your e-mail would appear to fall within the description of ‘ hot water system controls’ as found in Item 1(d) of Group 2, Schedule 7A VATA 1994. I have reproduced the relevant part of HMRC’s internal guidance on this subject below:
VENSAV3050
Thank you.