Heating System Replacement

[swnoel]

Originally Posted by Rusty

It could be the annual fuel utilization efficiency (AFUE) that he is talking about.

No it can't... only the manufacturer can manipulate that! He's talking about the efficiency the tech told him his boiler was after they did the combustion test. I've done thousands of them.

[Charlie T]

Originally Posted by swnoel

No it can't... only the manufacturer can manipulate that! He's talking about the efficiency the tech told him his boiler was after they did the combustion test. I've done thousands of them.

The reading the tech is taking using a probe in the stack is simply a combustion efficiency number that is based upon gas readings in the stack after it has left the boiler. This only is a measurement of how well the burner is turning fuel into heat energy, it has nothing to do with how efficiently the boiler is collecting that heat energy and transferring it to the water in your boiler/ heating system. The trick to saving money is to transfer as much of the heat energy into energy that is actually used to heat your premises. This is where the science, magic, Voodoo and unfortunately creative marketing come into play.

[DickR]

Originally Posted by Charlie T

The reading the tech is taking using a probe in the stack is simply a combustion efficiency number that is based upon gas readings in the stack after it has left the boiler. This only is a measurement of how well the burner is turning fuel into heat energy, it has nothing to do with how efficiently the boiler is collecting that heat energy and transferring it to the water in your boiler/ heating system......

Actually, measuring the stack temperature is a very good way of measuring the efficiency of recovering combustion energy into boiler water or air circulated to heat the house. With no useful recovery at all of the heat of combustion, the stack temperature would be the flame temperature. Every BTU of heat recovered from the flue gas lowers its temperature. Since the heating value of the fuel and heat capacity of the flue gas mixture are well known, it's very easy to correlate efficiency of heat recovery with flue gas temperature. Providing more heat transfer surface and a sufficiently low temperature of the fluid (water or air), the flue gas can be cooled to the point where combustion water is partially condensed, which adds a large amount of heat to the recovery, at roughly 1,000 BTU/lb.

[Irish mist]

Originally Posted by swnoel

No it can't... only the manufacturer can manipulate that! He's talking about the efficiency the tech told him his boiler was after they did the combustion test. I've done thousands of them.

It is the AFUE. Considering that you have no idea that new cars are far superior these days to older ones I'll take any of your future info with a grain of salt.

[swnoel]

Originally Posted by Irish mist

It is the AFUE. Considering that you have no idea that new cars are far superior these days to older ones I'll take any of your future info with a grain of salt.

LOL... cars of yesteryear had more metal in their front fenders than most cars today have in their entirety! I use to be able to fix my own ...today you need a multi thousand dollar computer do do just about anything! I don't care what you do ... but I can assure you that I've forgotten more about heating systems and their operations than probably everyone that has posted here! I always get a laugh when the weekend pros just their advice...

[Biggd]

Originally Posted by swnoel

LOL... cars of yesteryear had more metal in their front fenders than most cars today have in their entirety! I use to be able to fix my own ...today you need a multi thousand dollar computer do do just about anything! I don't care what you do ... but I can assure you that I've forgotten more about heating systems and their operations than probably everyone that has posted here! I always get a laugh when the weekend pros just their advice...

This is a silly comparison. Cars today are light years ahead of cars built 30 years ago regardless of how much metal they had in them. This is where I get to laugh.

[swnoel]

Originally Posted by Irish mist

It is the AFUE.

Explain who and how those numbers are figured and explain how their numbers correlate to true efficiency?

[Irish mist]

Originally Posted by swnoel

Explain who and how those numbers are figured and explain how their numbers correlate to true efficiency?

I don't answer to you. Figure it out yourself, it's obvious. How's your car doing, lol. Those old cars you from the 60s to the 80s were trash. Or those poorly made planes they make these days you fly on? They still in the air? You know jack. Stop derailing this thread with your nonsense.

If you tell me that new toasters at Walmart don't match up with older ones....than we can agree. Cars & planes. No sell.