Three basic types of shower available, Gravity mixer, mains-fed/boosted mixer and electric instantaneous, 1m of head, Minimum head required for a cistern-fed/gravity mixer, The impellor, Only difference between positive and negative head pumps, Positive head, If the shower is below the existing CWSC, Double-pole pull cord isolator, Must be used with an instantaneous electric shower, Negative head, When the shower is above the existing CWSC, 22mm until just before the mixer valve, What size pipe is required for a cistern-fed/gravity mixer, Pressure-reducing (regulating) valve, Used if a shower has an unbalanced supply.

#Showers

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