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The boilers you list are conventional , not combi rubbish, so it looks like you probably do have a gravity hot water system, fed from a tank in the loft. Hopefully, the cold water supply to the shower is also from the same tank.
The problem is almost certainly that the new shower has a higher minimum pressure requirement than the original.
It is becoming almost impossible to find taps, mixers, showers, etc. with really low minimum pressures since the rise of the combi boiler and a regulation change some years ago that replaced a minimum flow rate with so called water saving specification.
To make this work, I suspect a shower booster pump will have to be fitted.
The problem is almost certainly that the new shower has a higher minimum pressure requirement than the original.
It is becoming almost impossible to find taps, mixers, showers, etc. with really low minimum pressures since the rise of the combi boiler and a regulation change some years ago that replaced a minimum flow rate with so called water saving specification.
To make this work, I suspect a shower booster pump will have to be fitted.