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I can't keep my mouth shut anymore.

The name of this website is heatinghelp.com.; not inflatedegos.com or haughtybeliefs.com or knowitall.com or fauxtoughguy.com. There's nothing helpful about insulting others to make yourself feel better about yourself.

This place is a bunch of people who swing pipe wrenches and fire up torches and come home blackened at the end of the day and many of us have been doing just that for decades and we're going to call into question someone's toughness??? Grow up! It's embarrassing.

We're suppose to be professionals, right?

Environmental impact should be a concern for everyone consumers, and installers. One boiler at a time, one car at a time etc. We as an American society are gluttons in so many ways with all our resources compared to other geographical areas of the world.

And we barely talk about the difference in environmental impact.

What type material do you prefer to use going up an existing chimney...For high efficiently?

I use centrotherm polypropylene chimney liners. Then go in fairly easily less then an hour in most cases. The kit makes the chimney a air intake as well.

All the above comments are correct. My experience with a Knight 80 that is about 7 or 8 years old is that savings are about 30% from the old weil mclain 133,000 btu unit. However, because of the way modern high efficiency boilers operate, the comfort in my home is noticeably better. We have a 1960's house with about the same amount of baseboard as you and about 3000 sq. ft. of space. Temp swings are non-existent and it is very, very quiet. As far as maintenance, I do my own annual cleaning and it takes a few hours. The newer wall mount Knights may require less frequent attention, but others may have opinions about that. I have not had to replace any parts since the install. There are a couple of gaskets that get replaced during normal cleaning but that's been it.

The maintenance on a high eff. boiler is identical to every other boiler. Sure, some of the parts are more expensive, but 80% systems have expensive parts, too.

Not only do you save on thermal efficiency, but you can look at another 20-30% savings from burner modulation.

Why would it have to work harder? That makes absolutely no sense to anybody who understands heating equipment. We only install high-efficiency boilers and will never go back.