The ATO-540H-N tankless water heater uses up to 199,000 BTU/hr of natural gas to deliver an endless supply of hot water for a 3 bath home in northern climates and up to a 4 bath home in southern climates (one shower head per bath). Eemax is the #1 supplier of tankless water heater solutions. For over 25 years we've offered energy efficient, on demand hot water heaters for commercial applications, residential homes, and industrial safety applications. Our green, environmentally friendly water heaters offer the largest selection in the industry. Water Heater" section of this manual and also the current edi- tion of the National Fuel Gas Code, ANSI Z223.1, also referred to as NFPA 54 for specifics provided concerning air required. Fully-automatic Gas tankless Water Heater USER'S MANUAL FOR MODEL EZ-101 ISO9001 certified. Thank you for purchasing our fully-automatic gas-fired tankless water heater. As this water heater is a flue type, if mounted inside a structure, a flue must be installed to Zerodis Electric Water Heater 110V 3000W Mini Tankless Instant Hot Water System for Bathroom Kitchen Washing(Red) 2.3 out of 5 stars 7. 2018 New Arrival Household Mini Manual Ice Crushers Portable Handheld Handstyle Snow Crushing Ice Machine. More Buying Choices $41.78 (1 new offer) Tengchang 4.8GPM 18L Tankless LPG Liquid Propane Hot Water Heater Gas Houses Instant Boiler TC-Home 4.8GPM 18L Tankless LPG Liquid Propane Gas House Instant Hot Water Heater Boiler 5.0 out of 5 stars 1. $143.99. Tankless Water Heater Service Manual Key to Trade Names in this Manual: R/C Indicates both the residential and commercial versions. R/C42e includes R42e and C42e. RC Indicates condensing water heater models. (PLUS) Indicates that the Designer Plus models are included. R/C85ePLUS includes R85e, C85e, and R85ePLUS. On the side of the State's Non-Condensing Tankless Water Heaters are fully modulating, specifically designed for almost instant residential and commercial hot water appl