Last month I had several visits from my oil service people because of no heat in one of my zones (oil-fired, hot water, 3-Zone system). The solution was to bleed the system until the line essentially burped. Since those visits I've had to burp the lines myself (watched the techs carefully when they did it) a couple of times. However, I've had the house 18 years and this is the first time I've had this problem. Its been running OK for several weeks now, though.

Is there some inherent problem with the system that is allowing air in? Is there anything I can do to spot and.or stop the problem?

Scott<>

Do you have an expansion tank?

If the system is full of water, air can't get in unless water comes out. I would go over the entire system carefully looking for a water leak. Water could be being forced out a vent.

Last month I had several visits from my oil service people because of no heat in one of my zones (oil-fired, hot water, 3-Zone system). The solution was to bleed the system until the line essentially burped. Since those visits I've had to burp the lines myself (watched the techs carefully when they did it) a couple of times. However, I've had the house 18 years and this is the first time I've had this problem. Its been running OK for several weeks now, though.

Is there some inherent problem with the system that is allowing air in? Is there anything I can do to spot and.or stop the problem?

Scott<> do your system have an automatic air vent. It will have build up of minerals and dirt then let the water bledd out and let the air back... once the air is eliminate from the water the air vent should close off... **** unless it is lossing water somewhere

There was a leak from the upstairs recirculator and I had the bearing assembly replaced. I needed a couple of burps after that, but maybe that was just to clear the system since its been OK for about a month.

I think I have an expansion tank, but not sure.

Scott<>

Here in the UK air in heating systems is a common occurrence.
Much of the time it is not in fact air but a build up of Hydrgen gas.
This is caused by having dissimilar metals in the system I.E. cast iron heat exchanger copper pipework brass fittings etc.
We remedy this situation by a good flush through / clean out and introdution of a corrosion proofer / inhibitor.

M