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September 2nd, 2010 admin No comments

Tank Pump

Use Less Electricity With A Smart Header Tank Rainwater System

Nowadays people are under pressure to reduce their mains water consumption. Simply by using rainwater off our own roofs, we can reduce our use of mains water by 50% which will enable us to reduce our total carbon footprint.

However, most rainwater systems need a pump to get the water to where it is needed. Also, the pump must be powerful and requires electricity. This way does not help the carbon footprint and also the running cost has to be taken into consideration when fitting a rainwater system. Typical "direct feed" rainwater systems have a pressure sensitive pump which maintains pressure on the rainwater pipes to toilets, washing machines and any non-drinking-water tap. Every time an appliance is in use, the pump switches itself on. Furthermore, as pressure in the pipe run drops, the pump will start up again even when there has been no demand on the water supply. The pump, therefore, "hunts", i.e. it automatically turns itself off and on as needed throughout the day and night. So because the pump starting up draws a peak surge in power, electricity use is unnecessarily high. Additionally, this exertion increases the wear on the motor, seals and pump bearings.

Using a gravity feed system in conjunction with a specially-designed header tank solves this issue.

Energy-saving rainwater systems use a smart rainwater header tank. The main storage tank pump feeds rainwater up to the header tank. This way the appliances are fed by gravity. In smart header tanks, such as the Rain Director, the electronic sensor will start the pump only when the tank is completely empty. A 91 litre header tank will last for 12 toilet flushes, and a clothes washing machine cycle, i.e. more or less an average family's daily use. It also takes just under two minutes for the pump to refill the header tank. The pump would only cycle one time per day in your average home.

About ten times less power will be used. Presuming one washing machine use and 12 WC flushes each day, with a direct-supply pump system energy use is @ 1.5 kilowatt-hours (the same as using a 1000 watt electric fire for an hour and a half each day). With a smart header tank system, it is only 0.15 kwh per day. So with 1000 kwh costing around

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Rainwater Harvesting Limited supplies
rainwater harvesting systems
, storage tanks, pumps, filters and management systems to households and commercial businesses. RainWaterHarvesting.co.uk is a large information resource offering valuable technical information and advice in addition to 1000s of product specifications. Download the invaluable
rainwater harvesting tank size calculator