Unvented Hot Water Systems (Megaflo)
A good unvented hot water system will deliver balanced hot water with
superb flow rates. The system operates purely from
mains water and the principles of heating is exactly the same
as a traditional open vented system.
An unvented system requires many safety devices to accommodate
the greater pressure and expansion of water. If these safety devices
are not correctly installed, the system will be unsafe and could
be extremely dangerous to use.
The installation of an unvented hot water system must be installed by a properly qualified plumber, who has an unvented hot water certificate.
Today most new homes have unvented systems installed as standard and all
major manufacturers now offer unvented cylinders, such as Megaflo
(Heatrae Sadia), Telford Stainless Steel, Ariston, MODUS, etc.
There are major advantages to be gained with an unvented hot water system
- powerful and invigorating showers (without the need for
noisy pumps), balanced hot and cold water delivering superb
flow rates to modern mixer taps.
Below are some of the pros and cons associated with unvented hot water
systems:
| Pros | Cons |
|---|---|
| Hot and cold water supply to all outlets at high pressure Allows greater system design | If your house is supplied with a water main that has poor pressure and water-flow it will not perform correctly |
| Balanced hot and cold water supply pressures throughout the system | There is no back-up water to fill the cistern once emptied if the water main fails. |
| Cylinder can be sited almost anywhere within the property | The space an unvented system and its components take up is larger than that of a conventional cylinder |
| Flexibility allowing a wider choice of taps and mixers | The initial installation cost of the unvented cylinder can be higher than a conventional system. |
| High performance showers without the need for pumps | |
| No cistern in the loft (no risk of water stagnation, no risk of frost damage to pipework, no noise of filling cisterns) |
Apex Plumbing and Heating are fully qualified to install and commission unvented hot water systems.
Please contact us for further details or to arrange a no obligation written quotation.