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Sealed

Sealed heat only gas boiler systems

 

These are great if your water pressure is bad or you need another storage of hot water due to the amount of bathrooms you have in your house and have mains pressure coming out the taps. (Good for showers)

If you think you’ll need a heat only boiler, but don’t want lots of external components, a sealed system could be more suitable. This is a boiler system with a hot water cylinder, but the feed and expansion tank (usually in the loft) is replaced by an expansion vessel in the boiler, which also typically contains the circulation pump and may house some of the valves.

 

Here is a diagram of what a sealed system looks like.

sealed_system