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We stopped doing air conditioning service years ago, but back then I always saw few compressors laying around on the roof. You get what you paid for.

I do not think it is a good deal. If there is a burn-out, then part of tubing with black stuff inside must be replaced, cleaner/neutralizer must be added to Freon, new filter drier installed on gas...

to convert to 2 pipe system, remove return port plug and install by pass plug, then connect return line, shut off valve on return line must not be installed.

Running boiler on low temperature will cause condensation of vapor in the product of combustion, and along with sulfur will created acid environment at the gas side of the boiler and flue and chimney...

Indirect fired water heater will resolve your issue with high bills for domestic hot water.

There still a lot of things can be done to get efficiency and comfort out of equipment other than gas burning. The point I m trying to make we have to give customers options. They have to get...

http://www.hrt.msu.edu/energy/pdf/heating%20value%20of%20common%20fuels.pdf

lets say we have 100,000 bruhr input boiler
this is 1 therm of gas
in NYC 1 therm of gas roughly is $1.50
1 gallon...

It was 18 family building in upper Manhattan.



Limited experience? 30 years in the field and degree from polytechnic university with major in power plants. Oh, I'm also NYC master plumber....

Here comes disconnect between contractors and homeowners. Contractor assumes that ALL customers want lowest price, that ALL customers want high ROI. Yes, some segment of the market looking just for...

Argument about 10% difference in savings because standard boiler efficiency is 80% and condensing is 90% does not hold water because at the end we have to look at whole system efficiency not mythical...

Taco bumble bee on primary and secondary loops are standard on our installations. and radiator thermostatic valves are very strongly recommended as an option. On steam conversions TRVs are not even...

Well, a half at least. With conversion to gas fuel bill can be cut over 4 times down on really screwed up systems. On average 3 times down. And no zoning at all.

I really do not get the link you are making between over sizing the boiler and P/S piping. Correct me if I m wrong, but you stating that P/S piping needed only when boiler is oversized?

You can cut your bills in the half without converting to gas. Install I series taco 3 way valve with outdoor reset, bumble bee taco delta T circulator , or just retrofit radiators with thermostatic...

So, p/s needed only on what? Undersized piping? Why anybody would undersize piping? And even on undersized piping if you get bigger pump would it help to eliminate need for P/S piping?

"if you have a hydronic system, not steam, the piping is likely over-sized, if this is case primary/secondary near-piping is of no value and in fact unnecessarily wastes both the installation cost...

To the best of my knowledge bumble bee calculates indicated gpm and does not measure it. I had same problem, and now do not even pay attention to gpm indication. Why did you set bumble bee to...

if you use gas for heating domestic hot water, you have to deduct domestic hot water portion of gas usage from your gas bill.