Are your Rinnai boilers combi boilers? September 28, 2018 15:53 Updated Follow No, they are water heaters only. Related articles Rinnai Continuous Flow, Condensing & Non-Condensing Water Heaters Do I need a Flue with my Water Heater? The Ultimate Barbecue Guide Which water heater to use somewhere with no mains? New Energy Labelling for Gas Water Heaters Comments 0 comments Please sign in to leave a comment.