Water Supply for a Villa: Tanks, Pumps and Pressure

A practical guide to villa water supply: storage tank position and material, pump set, pressure vessel, water quality, hot water and planning the plant room.

In a city flat, water comes from the tap and the building system provides the pressure. In a villa or an out-of-town house things are often different: mains water is intermittent, pressure is weak or absent, or water comes from a well. In these conditions the home's water supply is designed as its own small system, with a storage tank, pump, pressure control, filters and a hot water unit. Their positions and sizes need to be resolved in the construction design.

Water source and storage tank

The first question is the source: a mains connection, a well or both. If mains water is intermittent, a storage tank keeps the house supplied without interruption. Tank volume is calculated from the household's daily use, the number of bathrooms, extra demands such as garden irrigation and a pool, and how long supply interruptions last.

When choosing where to put the tank, consider:

• an underground tank takes up no space and shields water from the sun, but needs excavation, waterproofing and measures against groundwater;
• a tank in a basement or plant room is easy to service, but floor loading capacity and drainage in case of a leak must be considered;
• a tank in the open yard heats up in the sun, can grow algae inside and spoils the landscape; in that case choose a closed, opaque tank and screen it.

The tank material must be approved for contact with drinking water. Plastic and stainless steel tanks are widely used; check the certificate either way.

The tank's fittings matter as much as the tank. A float valve at the inlet prevents overfilling, and an overflow pipe carries excess water safely away if the valve fails. The lid must keep out insects and dust, with access for inspection and cleaning. A drain valve at the bottom allows sediment to be flushed out periodically.

Pump set and pressure

Water is pumped from the tank to the house. A typical pump set consists of a pump, a pressure vessel (a membrane accumulator), a pressure switch and a gauge. The pressure vessel holds a reserve of water under pressure: when a tap opens, this reserve is used first, and the pump starts only when pressure falls to a set level rather than every time. This prevents rapid cycling and extends pump life.

A modern alternative is a variable-speed pump. It adjusts its speed to demand and keeps pressure steadier in large houses where several taps are open at once.

The pump is sized according to the building height, the distance to the furthest outlet and how many fixtures may run simultaneously. Minimum pressure requirements for shower heads, thermostatic mixers and certain water heaters are also taken into account.

Water quality

Well water or water stored in a tank for long periods may need treatment. To decide which system is needed, a laboratory water analysis comes first. The usual sequence is a coarse sediment filter, iron and hardness removal where needed, and a separate fine filtration system for drinking water in the kitchen. All filters must be accessible for servicing.

Hot water

With several bathrooms, a villa needs far more hot water than a flat. Options include a combi boiler, an indirect cylinder heated by the boiler, an electric water heater or solar collectors. In a large house, a recirculation loop can cut the wait for hot water at distant bathrooms: hot water circulates continuously, so cold water is not wasted when a tap opens.

Plant room and planning

Servicing is easier when the tank, pump set, filters, boiler and cylinder are grouped in one plant room. The design should show for this room:

• equipment layout and clear space for servicing;
• a floor drain for water in case of a leak;
• power supply, earthing and separately protected circuits for the pumps;
• wall and floor insulation so pump noise does not reach living areas;
• ventilation.

Irrigation and pool lines should be controlled separately from the house supply, with their own valves and ideally their own pump, so pressure in the house does not drop while the garden is watered.

Zaferoğlu İnşaat builds villas and private houses from the architectural design through building services to pool projects. Book a meeting with us to work out tanks, pumps and pipe routes for your villa while it is still on paper.