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Thread: Sacrificial Anode
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14th March 2016, 04:48 PM #1
Sacrificial Anode
I was wondering if double filtering the water before the hot water tank helps improve the life of the sacrificial anode. I know they aren't expensive when compared to the cost of replacing a hot water system, but the last anode I fitted only lasted for a 5 week trip to the Birdsville Races. I know the water in outback Queensland is pretty harsh, but I didn't expect the anode wear this quickly. Funny how most of the wear is at the threaded end, is this normal?
Caravan Mods_0647.jpgTo grow old is inevitable.... To grow up is optional
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14th March 2016, 05:07 PM #2GOLD MEMBER
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If the threaded end is where the hottest water is (ie at the top of the tank), then yes.
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14th March 2016, 06:33 PM #3
Forgot to say that this is a caravan HWS.
The anode is sitting horizontal at the bottom of the tank.To grow old is inevitable.... To grow up is optional
Confidence, the feeling you have before you fully understand the situation.
What could possibly go wrong.
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14th March 2016, 08:47 PM #4
The threaded end is generally the closest to a different metal (tank), and hence most likely to erode. Depending on tank materials and structure, there could be quite a few metals involved at that point, anode cap (brass), tank wall (MS or copper), tank bush for anode (MS, copper or brass) and the brazing/welding alloy (possibly 5-8 metal elements).
The original glass lined MS tank in our former home had a vertical anode about 1m long, it always ate out from the cap down. It was replaced with a SS tanked unit without an anode that was still going well after 21 years when we sold last year. Seems that they picked a SS grade that was extremely inert and the anode would have introduced additional metals and degraded the overall lifespan rather than enhance it. An identical unit installed at my uncles place 26 years ago has been totally fault free except for a burnt out thermocouple in the pilot system.I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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14th March 2016, 09:58 PM #5
Thanks for that detailed explanation Mal. So apart from nicer tasting water and reduced calcium buildup in the shower head the filters will have little, or no effect on the wear rate of the anode?
To grow old is inevitable.... To grow up is optional
Confidence, the feeling you have before you fully understand the situation.
What could possibly go wrong.
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15th March 2016, 09:10 AM #6
Correct. The anode is there to cater for the dissolved minerals. Suspended particulate is all that filters per se will eliminate. You need a "water softener" or a reverse osmosis system to eliminate (or convert) dissolved salts which is what causes your corrosion.
John
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15th March 2016, 10:54 AM #7
One thing I've learnt from this is that you don't use the hot water for cooking or making a cuppa unless you have a filter fitted AFTER the HWS.
To grow old is inevitable.... To grow up is optional
Confidence, the feeling you have before you fully understand the situation.
What could possibly go wrong.
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15th March 2016, 10:43 PM #8
What sort of hot water service is it John?
Neil____________________________________________Every day presents an opportunity to learn something new
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16th March 2016, 04:44 AM #9
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