![Rinnai commercial condensing tankless](/ext/resources/PM/2014/September/products/PM0914_Products_tankless-wh_Rinnai-UltraSeries_300.jpg)
The down-fired ceramic burner allows condensation to drain from the bottom of the heat exchanger, protecting the primary heat exchanger and burner. The design maximizes heating value and earns an Energy Factor rating of up to .95. Additional features include: Circ-Logic recirculation; temperature-lock; and scale detection system.