- HP Suitable for Unvented HP Systems
- This system stores hot water under pressure in a large cylinder, which can usually be found in an airing cupboard or a garage. The expansion vessel on top of the cylinder and the absence of a cold water tank can identify this system. - A high pressure mixing unit should be used with this system.
| - HP Suitable for Instantaneous Gas Heated Systems
- Commonly known as a combi boiler, this system heats up your water as soon as you turn the shower or hot tap on. A combi boiler is most often found in a kitchen. - A high pressure mixing unit should be used with this system.
- (Note: The warm up setting will not operate with a combi boiler)
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