My Hot Water cylinder is the WRONG size! What I've learned about heat pump hot water cylinders.

I've mentioned a little bit about this issue in previous videos but i've never gone into detail.
I hope this is enough detail for you all!
I cover :
- MCS rule of thumb guidance of 45L per person, per day of hot water.
- Manufacturers and their labelling and specification.
- How to deal with a smaller cylinder.
- Hot water efficiency and COP
Hope this helps those of you on your heat pump journey.
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My system :

Vaillant Arotherm Plus 7kW
200L UniStor Cylinder
45L Buffer tank
140sqM Detached 1997 built house
10mm copper microbore pipework downstairs

Installed by British Gas in November 2023
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