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Water Tanks
Water tanks have been used for thousands of years to collect water for various purposes. In modern water systems, a tank can provide drinking water and irrigation water for people, plants and animals. Water tanks are also used by industrial facilities.

Types
A water tank is selected according to the function that it will serve inside or outside a building. There are two main types of water tanks, elevated tanks, which are designed to hold water above the ground, and other tanks designed to hold water in the ground.
Captive Air Tanks
A captive air tank houses water and air in separate containers. Air pressure in the air tank is used to pump water into a residence or building. The water is contained in a pressurized rubber bladder.
Steel Tanks
Older buildings may have large or small water tanks made out of steel. These tanks are subject to corrosion and may leak and cause water damage to buildings. Newer water systems use a combination of smaller tanks to provide the same water supply to buildings once provided by huge steel tanks.
Hot Water Tanks
When buildings need heated water for industrial work or human consumption, the water must be stored in hot water tanks. These are commonly made out of fiberglass or metal.
Underground Tanks
Underground water tanks are useful for vacation homes, campgrounds, construction sites and resorts, according to Chemtainer.com. These large water holding tanks are made from synthetic materials, including plastic and polyethylene.
Hot water Systems
Hot water systems come in two main types, instantaneous and storage. Both can be suitable for most households, although there are restrictions on the installation of gas hot water systems indoors. Consult with your gas system retailer/supplier to ensure the safety of installing any gas hot water system indoors
- Instantaneous (continuous flow) hot water systems
- Storage hot water systems
There are more than four ways of providing hot water, but these are the most common:
- Open-vented hot water cylinder
- Combi boiler
- Mains pressure unvented hot water cylinder
- Thermal store
Open-vented Hot Water Cylinder
This is the most common. It is the ordinary dome-topped copper hot water cylinder most houses have in the airing cupboard. A simple store of hot water that can be heated by a central heating boiler or an electric immersion heater. When both are installed, the immersion heater is a useful backup method of obtaining hot water if/when the central heating boiler has a fault or breakdown.
Combi boiler
A central heating boiler with a complex internal arrangement that allows it to directly heat the domestic tap water as it flows through the boiler. Primary advantages are low installation cost and no space required for a hot water cylinder. Numerous drawbacks though.
Mains pressure unvented hot water cylinder
These run at mains pressure instead of being fed from a tank in the loft. The hot taps run as fast as the cold mains taps! Showers work brilliantly and baths fill quickly. They are expensive, need to be installed by a specialist with the correct qualifications, and can go wrong if not serviced regularly. Just like everything else really.
Thermal Store
The thermal store is heated by a normal gas boiler or by an immersion heater running on low cost night-rate electricity.
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