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Controls systems for central heating and hot water systems can be very sophisticated and you could write a book covering all the variations.
It is other best to consult the boiler manufacturer installation instructions as they often put forward some proven control solutions.
Generally there are two main types of configuration of a heating and hot water system.
- Pumping water from the boiler to the radiator heating system with a gravity circulation for the domestic hot water or,
- A fully pumped heating and hot water system.
There are advantages and disadvantages to each arrangement but possibly the pumped system may have the edge because pipe sizes are reduced to the hot water cylinder. A diverter control valve is used with this arrangement and this gives the option of running the heating or hot water systems together or separately.
Typical diagram of pumped heating and gravity hot water primary flow and return circulation.
Typical diagram of pumped heating and pumped hot water primary flow and return circulation.
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