What additional component must be installed in a combination system to stabilize water pressure?

In a combination system, which typically involves both heating and cooling or use of domestic hot water, stabilizing water pressure is crucial to maintain system efficiency and performance. An expansion tank plays an essential role in managing water pressure fluctuations.

When water is heated, it expands. If this expanding water has no place to go, it can create increased pressure within the system, potentially leading to damage or failure. The expansion tank provides an air cushion that absorbs the excess pressure generated by the thermal expansion of water, thus maintaining stability within the water pressure system.

By allowing for this controlled expansion, the expansion tank ensures that the system operates within safe pressure limits, preventing pressure spikes that could affect the overall performance of the combination system. This is why installing an expansion tank is considered a necessary component in such configurations.