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System Boilers
A system boiler is the modern expression for, basically, a low water content boiler. But with all the necessary extras to fit to a sealed, fully pumped system built in. This allows quick and easy installation. (Also looks a lot tidier than the a low water content boiler with the necessary extras to make it a sealed system)
These are larger then a standard low water content boiler because of the extra components within the boiler, but are a lot easier to install.
This picture shows an expansion vessel containing a pressure relief valve, gauge and filling loop, which is the basic difference between a low water content boiler and a system boiler.
To the right is a system boiler fitted to a "Y" Plan system with an open vented foam lagged cylinder for the hot water
To the left is a system boiler fitted to a "Y" Plan system using an Unvented cylinder for the hot water.
No header tanks are used in this system, Will fill a bath in less time and give a high pressure shower with a suitable mixer valve
the hot water delivery will be at the same rate as the cold water
Advantages
Cheap
to run
Reliable
Good hot water flow rate (depending on type of cylinder)
Longer
lifespan
Disadvantages
More expensive to install
Parts
can be expensive
Takes up more space