Electric showers heat water from the cold water supply as it passes through the unit. Its advantage is that you get instant hot water and is economical. The disadvantage is that you get low flow rates and a limited range of designs.

Gravity fed showers are the most common type of system and rely on the natural flow by gravity from the cold water storage tank which needs to be at least three feet above the shower head. Its advantage is its cheap to buy, with an extensive range available. Its disadvantage is that stored hot water is required and it has low flow rates.

Pump systems are by far the best type of shower. A high pressure supply is guaranteed by using a shower pump connected to both hot and cold stored water supplies. Its advantage is that you get a constant high volume, high pressure spray, with variable, pulsating heads and body jets available. Its disadvantage is that stored hot water is required and it is the most expensive to buy.

Combi boiler/multi point showers are mains fed, the hot supply via the boiler and the cold supply direct. Thermostatic valves are strongly recommended due to potentially high temperatures from the boiler. Its advantage is that it gives you instant hot water, with multifunctional heads available ant it is economical. Its disadvantage is that performance cannot be improved if stronger shower is required.

	Flow switched positive head pumps are used in positive head situation where at least 0.5l of water can be supplied from natural gravity flow to the shower head (i.e. the highest outlet).
	Pressure switched negative head pumps are required when the position of the shower is above the cold water storage tank means the system does not benefit from a flow of gravity.
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