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Unvented Systems
These systems have no cold-water storage tank.
In an unvented system, there’s no need for a cold-water tank; instead, a sealed hot water cylinder is supplied directly by the cold mains water. Operating at mains pressure, unvented systems provide excellent flow rates, enhancing shower and bath performance.
Unvented systems also eliminate the need for a cold-water tank in the loft, freeing up valuable space and reducing the risk of freezing during winter. Since these systems don’t rely on gravity to distribute hot water, the cylinder can be installed almost anywhere in your home.
Additional benefits include reduced system noise, as there’s no cold water cistern refilling, and improved water quality, as the sealed system prevents contamination of cold water.
Indirect Hot Water Cylinders
Indirect hot water cylinders use an external heat source,
like a gas boiler or solar thermal system, to heat water.
The hot water circulates through a copper coil in the
tank, transferring heat to the water inside. These systems
often include a direct backup, such as an immersion
heater, ensuring hot water availability even if the
boiler fails. Available as vented or unvented, they offer
flexibility to meet various needs.
Direct Hot Water Cylinders
Direct hot water cylinders heat water with an internal element, like an immersion heater. Ideal for homes without gas access, they can utilize Economy 7 for cheaper nighttime electricity rates. These systems often have two immersion heaters for peak and off-peak use, which should be set on timers to minimise costs. Available as vented or unvented, they offer flexibility for different home needs.
For expert advice or to schedule an appointment with one of our engineers, please contact us.
Vented Systems
These systems are fed from a header tank.
Vented hot water tanks remain the most common hot water systems in the UK. Unlike newer unvented models, these copper tanks are supplied with cold water from a header tank, typically located in the loft, and utilise gravity to distribute hot water throughout the home. A vent pipe connects the vented hot water cylinder to the cold water in the header tank.
While expansion of warm water is still a consideration, in vented systems, it occurs through the vent pipe and into the header tank. The pressure of the hot water is influenced by the height of the water tank above the tap or shower feed. Consequently, while ground floor pressure may be excellent, upper floors often experience lower pressure. To address this, many homes with vented hot water tanks use electric pumps to enhance shower pressure.
Vented hot water cylinders are generally simpler than pressurised unvented systems, making them easier to maintain and install. This simplicity translates to lower costs compared to unvented options.
We service & install commercial heating too!
We service and maintain heating systems for nursing homes, schools, churches, letting agents and corporate clients. From design to installation, we are able to accommodate a vast array of projects regardless of size or complexity.
Areas we cover
We provide heating services to homes and businesses
across Surrey, Hampshire and West Sussex.
- Haslemere
- Grayshott
- Godalming
- Cranleigh
- Guildford
- Woking
- Alresford
- Alton
- Bordon
- Farnham
- Aldershot
- Camberley
- Liphook
- Petersfield
- Midhurst
- Chichester
- Portsmouth
- Waterlooville
