Unvented Central Heating System

Vented central heating systems versus unvented pressurised heating system.

Unvented central heating system.

It has a loose fitting lid and is partially filled with water. Unvented cylinders don t require a cold water storage tank which is ideal if you are pushed for space as well as offering more flexibility when siting the. As unvented cylinders work from the power of the mains water supply the mains pressure and flow rate must be adequate. A megaflo also known as a megaflo system megaflo unvented system or often misspelt as megaflow system or megaflow boiler is a stainless steel unvented cylinder that stores hot water as part of a central heating system.

An unvented hot water cylinder is a pressurised system which is fed directly from the cold mains water feed and therefore can deliver hot water at mains pressure which is great for improving the performance of your shower and bath. With unvented systems there is no need for a cold storage tank which helps free up space and requires much less pipework. Before you begin turn off your boiler at the mains power supply and let the water in the entire system cool down. Supply pressure should be around 2 bars and able to supply the required flow rates.

Draining down a sealed central heating system in a pressurised system there is no new water being added on demand water is only ever added to the system when needed and necessary. In a vented heating system at the highest point in the system there is at least one header tank. What is an unvented megaflo boiler system.