Boiler Aquastat Replacement Cost in Vancouver
Published: July 22, 2026 — BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning — Greater Vancouver, BC
What the Aquastat Does
The aquastat is a temperature control device that maintains boiler water temperature. It has three functions: high-limit (shuts off boiler if water overheats), low-limit (maintains minimum temperature), and circulator control (turns pump on/off based on temperature).
Signs of Aquastat Failure
The boiler water temperature does not match the aquastat setting, the boiler short-cycles or runs continuously, the circulator pump does not run when it should, or the boiler overheats and triggers the high-limit frequently. An inaccurate aquastat wastes energy and reduces comfort.
Replacement Cost
Aquastat replacement costs $300-600 including the device ($150-300) and labour ($150-300). The boiler must be partially drained. If the boiler is over 15 years old and the aquastat fails, consider boiler replacement — multiple components are likely near end of life.