Question

On smaller capacity hot water boilers, what type of control is commonly used, and how is it referred to? How does this control function, and where is it typically mounted for temperature sensing?

Answer 1

Smaller capacity hot water boilers commonly use a thermostatic control or aquastat, which senses the water temperature and manages burner operation to maintain a desired range. It is mounted near the boiler for accurate temperature sensing.

Step-by-step explanation:

On smaller capacity hot water boilers, the type of control commonly used is a thermostatic control or aquastat. An aquastat functions by sensing the temperature of the water within the boiler and controlling the burner operation to maintain water temperature within a set range. It operates on the principle of expansion and contraction of a liquid within a temperature-sensing bulb; as the water temperature rises, the liquid expands and triggers the control to shut off the burner and vice versa.

The control is typically mounted on or near the boiler in a location where it can accurately gauge the water temperature. In an on-demand electric hot water heater, heat is supplied to water only when needed, which can be regulated by this type of control to maintain efficiency and reduce energy consumption.