i have a 23 year old slant fin gas boiler it is 225,000 btu's and i need to replace it because of a cracked tank.Which are the better ones and what should i watch out for. Some of these plumbers here in New Jersey are shady and all the ones i know do oil burners and not steam gas. I had a few estimates from $4500.00 to over $8000.00 but i dont know that much about boiler quality and which ones last the longest. Any help would be great thanks!