Vented hot water tanks are still the most common type of hot water systems found in the UK. Unlike the newer unvented tanks, these copper tanks are fed by cold water from a header tank (normally located in the loft) and they use gravity to drive the hot water around the home. A vent pipe links the vented hot water cylinder and the cold water in the header tank.
As with the unvented system, expansion of warm water is still an issue, but in this case the expansion simply takes place via the vent pipe and in the header tank.
The hot water pressure tends to be governed by the height of the water tank above the tap or shower feed, which means that although on the ground floor of the home the pressure might be excellent – in rooms on upper floors the pressure will be lower. As a result many showers in homes with vented hot water tanks use electric pumps to drive the hot water to the shower at increased pressure.
Vented hot water cylinders are far less complicated than the pressurised vented systems and for this reason they are much simpler to maintain and install – making them a far cheaper option when compared to the unvented system.
- Kitchen and Bathroom Fitting
- Unvented Pressurised Hot Water Systems
- Vented Gravity Fed Hot Water Systems