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Luke and Elizabeth May

I have a low pressure hot water system with a wet back and I'm wondering if a pressure boosting pump can be fitted to increase pressure from the system? if so, what would the rough price be to do this please if I get 240volts to the top of the cylinder? I climbed into the roof and had a look see, there is definitely a tempering valve that protects the entire system and both showers are feed their cold water from the header tank and have mixers