Thanks for the tip diyfixman and oi789; you guys are the best!
Now tell me how to get 400k BTU rocket heating water for iron radiators. I really like the Euro ceramic concept; I bet they'd combine well. The 400k was established by a heating contractor for ~104,000 cubic feet, full of iron machine tools.
Were I work, natural gas blowers hang from the ceiling. Useless POS; blasts you in the face here and there, but machine handles so cold you don't even want to run them.