This is a Hydronics system that ECWS completed earlier in the year in an Ohio correctional facility. We removed 2 boilers that were less than 65% efficient last year with 2 each RBI XLFs 3.5 million BTU units that are 88%. Both boilers were in need of heat ex-changer replacements that was going to cost them near $60,000. This year we removed the 3rd and final boiler. All were replaced with RBI XLFs. The heaters ran less and the gas consumption was cut by approximately 30%. Since the repairs needed on the old boilers were so expensive and the gas consumption reduced considerably the ROI on these boilers is less than 3 years.