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Old 12-23-2015, 05:40 PM   #11
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Quote:
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Re: expansion tank. I have an Amtrol bladder type expansion on my own boiler that is 23 years old. It did lose its precharge once over this time period but still appears to be fine.
Ok... That's one that lasted, proving that there are always exceptions to the rule.

Now how many have you replaced that were just a few years old that either had bad diaphragms or had holes rotted through them?

And how many old-style tanks have failed on you? (Not counting ones with nails driven through the top)
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Old 12-24-2015, 07:19 AM   #12
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True, but how many relief valves have released due to the old style tank not being drained ? Also, how many of those that were full of water and hung by band iron and a couple of 10 penny nails, bent over for support. I sure wouldn't ever walk under one ! I will agree with you, they do last. I have seen them in houses 75 + years old. Not going to get that out of an Amtrol !
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Old 12-24-2015, 07:52 AM   #13
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True, but how many relief valves have released due to the old style tank not being drained ? Also, how many of those that were full of water and hung by band iron and a couple of 10 penny nails, bent over for support. I sure wouldn't ever walk under one ! I will agree with you, they do last. I have seen them in houses 75 + years old. Not going to get that out of an Amtrol !
Also...

If the hydronics guy/burner tech who maintains the system does his/her job properly the tank should never be full of water!
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Old 12-25-2015, 08:21 AM   #14
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The truth is most people don't maintain their systems and only call someone in when something is wrong. They want their heating systems to be completely automated and maintenance free. The world is lazy & they just expect things to work.
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Old 12-25-2015, 12:23 PM   #15
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The truth is most people don't maintain their systems and only call someone in when something is wrong. They want their heating systems to be completely automated and maintenance free. The world is lazy & they just expect things to work.
That is very true, it's a shame that people can't realize the amount of good that a little maintenance can do.

This system will have an oil fired boiler though, and I know it will be properly maintained so I'm not worried about it.
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Old 12-26-2015, 07:15 AM   #16
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mrgreek- Truer words were never spoken. Just a little annual maintenance, will increase the life expectancy of a boiler exponentially. They do not want to spend a few hundred dollars every year, as opposed to (a 4,000 square foot house) 7-10 thousand every 10-15 ! People will save pennies to spend dollars !!
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Old 12-29-2015, 09:28 PM   #17
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I always thought bladder style expansion tank would protect system from air pockets in the system when off for the season. Maybe in Canada your heating system doesn't sit idle as long. With old fashioned tank type systems, If the tank gets waterlogged, where does the air go? It doesn't disappear, extrol tank and purge valves can keep me home in cold weather, not out after hours for a service call.
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Old 12-30-2015, 10:22 AM   #18
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I always thought bladder style expansion tank would protect system from air pockets in the system when off for the season. Maybe in Canada your heating system doesn't sit idle as long. With old fashioned tank type systems, If the tank gets waterlogged, where does the air go? It doesn't disappear, extrol tank and purge valves can keep me home in cold weather, not out after hours for a service call.
It goes to the hi spots lol
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Old 12-30-2015, 05:00 PM   #19
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Connect the expansion tank under the air seperator(or close to it), hanging down so that you dont get heat migration into the tank (which will dissolve the bladder over time). If you have room to have the tank about 2 feet from the supply it will last 5-10 years ( depending on the water you put in). Those old tanks are bad for the system you are installing. Over time the air in the tank will be absorded into the system and vented off( leaving no room for expansion/ relief will start to blow off). If you are using black pipe there will always be corrosion because of the oxygen from that tank. Radiant heating hates absorbed oxygen
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Old 12-30-2015, 05:28 PM   #20
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Radiant heating hates absorded air*
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