For most people a single boost on the hot is good enough as 2/3rd of the water for a hot shower is hot water and most mixers will balance differential pressure up to a factor of 5.

If your mixer needs more balanced pressures, your cold pressure is very low, or you simply like cold boosted showers, then a SPB on the hot and on the cold is required.

Detailed instructions are sent with every Shower Power Booster to help you get the best out of our products and there is a fitting advise helpline, however you can, if you think you need two pumps opt for our two booster kit the SP22S now. You can buy a Single SP2B now and upgrade with a SP2U later if you find you need a second pump.
Buy a SP22S two booster, fully automatic kit Now
Upgrade from a SP2B single fully automatic to a top pump SP22S kit now