Dunkirk H2OI Single Coil Stainless Steel Indirect Water Heaters - Manual (Page 21)

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5. Inspect Anode (annual)
• The purpose of the magnesium anode is to reduce the damaging effects of aggressive water on the water
heater. Aggressive water will cause the anode(s) to erode. The anode(s) must be inspected at least annually
to determine whether a new anode should be installed. Use anode replacement parts supplied by ECR only.
ECR anodes are 1-1/4 NPT and are made with magnesium, brass, and stainless steel. There is no steel in a
ECR anode. Severe or rapid deterioration of the anode indicates very aggressive water. If this occurs, have
the water tested to verify whether it is within the limits outlined on page 11. Failure to inspect the anode
regularly and replace if necessary could result in damage to the water heater. If this unit is installed and
maintained according to the instructions and conditions in this manual, this product will last for a long time.
1. Close domestic water isolation valves.
2. Drain the water heater completely and allow it to cool off.
3. Remove the anode cover on the front of the unit. See figures on pages 6 and 7. The temperature control
can be turned to the side to allow easier access.
4. After the water heater has drained and cooled, remove the anode using a 1¾” 6-point socket and a
breaker bar.
5. Inspect the anode and replace if needed. The anode should be replaced when more than 6” of core wire is
exposed. The anode should be replaced with a ECR supplied anode only. See above. The brass hex on the
anode is 1¼ NPT and installs into a 1¼ stainless half coupling on the shell of the tank. This part will need
to be properly Teflon taped and coated with a quality Teflon based pipe sealant.
6. Replace the inspection cover.
7. Refill the water heater, and restore to operation.
8. Verify operation of boiler and water heater.