I'm planning on fitting a power shower shortly but I have a couple of questions first. The hot water cylinder isn't very big it says on it 36''x 16'' so I know I cant fit a 3 bar pump but what is the highest I can go without draining the tank too quickly. Secondly the central heating boiler is nearing the end of it's life so I was planning on fitting a condensing combi boiler, I have been told by several people that you can't have a power shower with a combi boiler is that true(if it is why) because some of the power shower brochures I have say suitable for instantaneous heating I presume that means a combi boiler.