Service indirect water heater
Why it matters
Indirects need aquastat and zone-valve checks; failure causes sediment, corrosion, and loss of hot water.
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How to do it
- 1
Locate indirect tank and connected boiler.
- 2
Check aquastat temperature setting (typically 180-190F).
- 3
Verify zone valve opens with demand and closes when tank reaches temperature.
- 4
Inspect tank exterior for leaks or corrosion.
- 5
Open lowest drain valve to flush sediment.
- 6
Close drain, refill, and test hot water flow.