Hi. We've got a combi boiler and no shower. Our water pressure is pretty variable, particularly the hot. We are desparate to have a shower fitted, and were trying to choose between a 10.5kw electric, and a shower pump (electric obviously being cheaper). We've just found something called a thermostatic pumped shower - any ideas what it is, how good it is and whether it can be used with a combi? Or any helpful hints and suggestions...