Darius from Plumbdog is out on-site at a large accommodation complex in Perth to troubleshoot major commercial hot water issues — and this setup is no small job! With three huge Thurman 32 water heaters running on a circulating ring main, this system provides hot water for dozens of guests… when it’s working properly.
The Problem
The property reported inconsistent hot water and low flow, and it didn’t take long for Darius to find the culprits:
•A failed Grundfos circulating pump stopping the ring main flow
•An electrical fault preventing both pumps from running correctly
•Corrosion and missing pressure relief protection on the system
The Fix
To get everything running safely and efficiently again, Darius:
•Installed new Grundfos dual pumps for reliability and redundancy
•Added an expansion control valve to prevent over-pressurisation
•Cleaned and checked all pipework and connections for corrosion
•Tested system operation — restoring 96L/min of steady hot water throughout the building
“Commercial hot water systems need balance — if one component fails, the whole setup suffers. Regular servicing is the key to keeping everything flowing.”
The Result
Hot water fully restored across the complex
Circulation loop now running smoothly with proper pump control
Pressure safely managed with new relief and expansion valves
System protected for the long haul with proper maintenance practices
Location: Perth, WA
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