RBI’s Infinite Energy2 uses a radial variable circulation, stainless-steel heat exchanger for efficiencies up to 98%. It is available from 199 MBH to 1,000 MBH and up to 20:1 single-unit firing rate modulation. Units are PVC-, polypropylene- and stainless-steel-vent capable and can be installed in a multiple (8 max) unit master/member configuration. The control provides auto diagnostics of all major components and functions. Back-lit visual readouts include water flow sensor and supply, flue and tank temperature for immediate system feedback.