Also known as a conventional or regular boiler, an open vent boiler is part of an open vent heating system that includes feed and expansion tanks in the loft (that are open to atmospheric pressure) as well as a storage cylinder. The hot water is heated via the storage cylinder.
It's time for an update
You've been using your good friend IE for quite some time now. It has been a reliable companion for probably the last 20 years.
Unfortunately, due to technology constantly evolving, we would like to kindly ask you to update your browser to one of your liking from the ones listed below. This will ensure that you're going to have good time on our site. Actually, any site really.
Farewell, Internet Explorer.