Installer recommendation in my area

I'm in Colorado, sorry I will not drive that far! Have you tried checking the 'find a contractor' link on this site?

Some thoughts,

The square footage of your house has little to do with the boiler you pick, it should be sized based on the EDR of the connected load. Make sure that whoever you pick is willing to stipulate in their contract that the boiler will be sized according to this (verify the number yourself, we can help you with this if you want) and that the boiler is to be installed ACCORDING TO THE MANUFACTURER'S INSTALLATION MANUAL!!!! The layout and minimum sizing of the riser(s), header, equalizer, and hartford loop stipulated in the manual ARE NOT UP FOR DEBATE!
Make sure that your contract also includes installation of a skim port (this will be in the manual) and that they properly skim the boiler BEFORE putting it into operation. Skimming is long and boring and involves someone sitting by the boiler babysitting a very slow trickle of water into a bucket. This can take HOURS. Unless a newly installed steam boiler is properly skimmed, you will get banging, surging and all manner of different problems.

Some extras (not technically required) that you may want to include as well, would be a vaporstat (as opposed to a pressuretrol) and a low pressure gauge (0-3 psi is pretty standard for this, code stipulates that you must have a 0-30 psi gauge as well). These will aid you in getting the efficiency as high as possible. Talk to your installer about checking the system for proper operation as well. Proper pitch of the mains, adequate venting in the proper place, proper operation of any condensate traps, etc...(depends on exactly what type of system you have).

My best advice would be to get some books, educate yourself, and ask questions. We are all on here because we we love to talk about heating, so ask away. Some of the best steam experts in the country frequent this site! 'We Got Steam Heat' is a great book for a homeowner to have, and 'The Lost Art of Steam Heating' will explain anything you want to know in detail (though easy to read). 'Greening Steam' may be of interest to you as well. All available from the store on this site.

Welcome to steam heat! It is likely that your system can be tuned to be very efficient and comfortable. With a new boiler and some maintenance, it will likely out last you!

If you click 'Main Site' at the top of the page will be 'find a contractor'

Stephen Minich is in the Chicago area. You won't get any better.

@bageise

Pretty much the same stuff applies. EDR survey is still necessary, however a heat loss calculation will also be crucial, make sure they do one (this will take several hours and they may not do one unless they get the job, contract should reflect this) and make sure the boiler is not oversized, at a guess your current boiler is about 4 or 5 times the size you actually need. The manual should always be followed. Obviously the steam specific advice can be ignored (no skimming a hot water boiler for instance, nor does the piping need pitch), however the system should still be checked over.

If I were to bid on this I would include replacing the pumps (I would suggest one pump and zone valves not sure why you have multiple pumps and zone valves), removing the compression tank hanging from your ceiling and replace with a bladder type expansion tank replace the boiler feeder, re do most of the near boiler piping with proper piping support, adding a good air separator, check the flue for proper installation and rectify any problems with it (you may need a flue liner installed), replace the gas shutoff, likely add an outdoor reset control of some kind as a recommended upgrade (if it was not included with the selected boiler), and clean up the wiring as a minimum. If you get multiple bids make sure they are all apples to apples (especially in regards to what system components they are replacing)

The kind of boiler is something to consider as well. If you want efficiency you can go with a modulating condensing boiler (also called a modcon, these are the Cadillacs), however the lifespan will be less, and there will be more maintenence, cast iron will have a longer life with less maintenance, at the cost of lower efficiency. A low mass fin tube boiler is a kind of middle ground, on all counts. The thing with modcons is that they like low temperature systems, which yours is not. They also require a special flue system which will add to the cost of installation. A modcon operating at high temperatures will only be marginally more efficient than a fin tube boiler. If there is an excess of radiation as compared to the heat loss of the structure, you may be able to run a modcon efficiently as you can run it at lower temperatures. Only the numbers will tell.

Hot water heat is good too, and for what its worth the lost art of steam heating is still a great read!