Despite being told in the last thread it wont work, you've still gone ahead. A 10.5kW shower will heat more water to required temperature, but if you dont have the supply to cope then it's a waste of time.....
Pumping is unlikely to solve anything, the pump will be trying to pull more water than the supply can provide, possibly causing the pump to cavitate (and wreck it), and the shower to keep cutting out when the pressure drops after the supply is temporarily exhausted.
Needs either a new supply from main to property, or a storage tank feeding a pumped electric shower, such as a Mira Elite.
Pumping is unlikely to solve anything, the pump will be trying to pull more water than the supply can provide, possibly causing the pump to cavitate (and wreck it), and the shower to keep cutting out when the pressure drops after the supply is temporarily exhausted.
Needs either a new supply from main to property, or a storage tank feeding a pumped electric shower, such as a Mira Elite.