Un-Vented hot water and central heating systems

A&H Projects can install and maintain un-vented hot water and central heating systems. We have fully qualified, motivated and experienced engineers to assist you with you requirements.

When an un-vented hot water system is installed both the hot and the cold water supplies within the dwelling, deliver water at the taps or shower outlet at mains water pressure. Cold water from the mains is delivered to the base of the cylinder, the water is heated, then when a tap or shower is turned on the mains water pressure pushes the hot water out. To allow the water that is heated in the cylinder to expand as it is heated, an internal or external expansion vessel is used; a pressure relief valve is also fitted should the vessel fail.

An un-vented hot water storage cylinder can be heated directly via an immersion heater or indirectly by most heating systems providing it is not a solid fuel burning appliance. They are ideal where high performance is required or in multi story properties where it would be difficult to gain the necessary head of water via a cold water storage tank to feed taps on the upper floors.

Un-vented heating systems have built-in safety devices consisting of a thermostat on the cylinder, a thermal cut-out operating on the energy input to the system and a temperature relief valve. These devices need to be maintained and serviced regularly to ensure the correct system operation; this would normally be completed in conjunction with your annual boiler service. Maintenance

For advice or a free quotation from A&H Projects please complete our contact form or email us.