These mains booster pumps really are a waste of time and money for the vast majority of us. I'm well aware lots of people are gonna say..."i've got one and its great, never had any problems". I've had a few too !!
Here's what they're designed for and how they work........they're designed to keep your mains pressure at a constant pressure (for example we'll just use 70 PSI as an example). When your taps are off and the pressure builds up to 70 PSI then the pump shuts off. All good so far. When you open a tap then the water comes out and the pressure drops, the pump senses this and kicks in and trys to keep up 70 psi. If you where to open two taps and flush the bog then depending upon the pumps flow rate you will find that you are not getting 70 PSI out of every tap, becauise it can't keep up with the flow. The extra 'tank' on these "booster pumps' houses a pressurised bladder, this is to alleviate the pump kicking in and out when you've just used a small amount of water. As constant stop starting of the pump is apparentley not good for it. To keep up with what you want its going to need to run flat out, this pretty much negates the need for a bladder tank. So you may as well save about £200 and just get a powerfull jet pump that just runs, as its not going to need to cut out until your tank is full.
Here's a pump that many here have recomended.........£300..........
http://www.machinemart.co.uk/shop/product/details/cbm240e-1in-multi-stage-230v-booster-pumI'm sure its great. Here's what i use currently..............£108............
http://www.machinemart.co.uk/shop/product/details/051012200Working fine here, shows 80 PSI across both pre filters. You can get it to go higher, although if you do you'll be severley restricting your waste output. You can get this pump what i use a lot cheaper from either ebay or screwfix, £70 ish i think.
