On Tuesday 8th September I had a customer near Portsmouth who wanted to replace a large noisy and troublesome pump in the loft with Shower Power Boosters. The resulting shower using my micro pumps followed on from equally good showers from his failed bigger pumps, but unlike those pumps my SPBs will still create a great shower but with no risk of cavitation.
Fitting a showerpowerbooster in the loft is simplicity itself and this simplicity reduces installation costs, increases hydraulic efficiency, and also reduces future maintenance costs. If you already have a traditional pump in the loft do not be afraid to rip out all the unnecessary pipework.
To give you the confidence to do so I will explain the design rational required for a traditional loft pump and why with a shower power booster these features are not required.
Fitting a SP22S in the loft:-
Fitting a traditional pump in the loft requires you to avoid cavitation which can destroy a pump in a very short time. Cavitation can occur when the pump effectively over pulls water towards it which lowers the suction pressure below the dew point of water and creates shock waves in the water. It will sound like the pump is pumping gravel and it will destroy itself! I have designed out the risk of cavitation for Shower Power Boosters.
Looking at the drawing above there are many features you do not need.
Raise the Cold Water Tank.
Traditional pumps need at least 600mm head so the only option is to raise the level of the cold water tank. Failure to do so will cause cavitation and/or pull in air. Shower Power Boosters needs minimal head which will be achieved without raising the cold tank.
Use of Essex Or Surrey Flanges
Traditional pumps need a dedicated 22mm feed direct from the hot water cylinder feeding just the traditional shower pump. Shower Power Boosters simply connect to the vent pipe in the loft even if that pipe is 15mm (its better if its 15mm and not 22mm but if you have a 22mm vent pipe thats good enough).
Other Unwanted Features
Antigravity link (not needed)
22mm pipe from tank to loft (not needed)
8 Full Bore Valves (not needed)
2 Manual Air Vents (not needed)