up to 500,000 BTU/hr at 93% efficiency, 1.9 Gal/hr
up to 6,000,000 BTU/hr at 96% efficiency, 40 Gal/hr.
up to 20,000,000 BTU/hr at 96% efficiency, 132 Gal/hr
up to 20,000,000 BTU/hr at 96% efficiency, 132 Gal/hr
up to 20,000,000 BTU/hr at 96% efficiency, 132 Gal/hr