CHAPTER 5 WATER HEATERS - eCodes

1 CHAPTER 5 WATER HEATERSSECTION provisions of this CHAPTER shall govern thematerials, design and installation of WATER HEATERS and therelated safety devices and WATER heater as space a combinationpotable WATER heating and space heating system requires waterfor space heating at temperatures higher than 140 F (60 C), amaster thermostatic mixing valve complying with ASSE 1017shall be provided to limit the WATER supplied to the potablehotwaterdistribution system to a temperature of 140 F (60 C) orless. The potability of the WATER shall be maintained throughoutthe Drain valves for emptying shall beinstalled at the bottom of each tank-type WATER heater andhotwaterstorage tank. Drain valves shall conform to ASSE HEATERS and storage tanks shall belocated and connected so as to provideaccessfor observation,maintenance, servicing and WATER heater WATER HEATERS shall bethird-party WATER temperature control in piping from temperature of WATER from tankless WATER heatersshall be a maximum of 140 F (60 C) when intended fordomestic uses.

2 This provision shall not supersede the require-ment for protective shower valves in accordance with Pressure marking of storage tanks andwater HEATERS installed for domestic hot WATER shall have themaximum allowable working pressure clearly and indeliblystamped in the metal or marked on a plate welded thereto orotherwise permanently attached. Such markings shall be in anaccessible position outside of the tank so as to make inspectionor reinspection readily Temperature hot WATER supply systemsshall be equipped with automatic temperature controls capableof adjustments from the lowest to the highest acceptable tem-perature settings for the intended temperature operating HEATERS shall be installed in accordancewith the manufacturer s installation instructions.

3 Oil-firedwater HEATERS shall conform to the requirements of this codeand theFlorida Building Code, Mechanical. Electric waterheaters shall conform to the requirements of this code and pro-visions of CHAPTER 27 of theFlorida Building Code, WATER HEATERS shall conform to the requirements oftheFlorida Building Code, Fuel Elevation and of waterheater ignition sources and mechanical damage protectionrequirements for WATER HEATERS shall be in accordance withtheFlorida Building Code, Mechanicaland theFloridaBuilding Code, Fuel Rooms used as a HEATERS using solid, liq-uid or gas fuel shall not be installed in a room containingair-handling machinery when such room is used as a WATER HEATERS installed in containing awater heater shall be provided with an opening and unob-structed passageway large enough to allow removal of thewater heater.

4 The passageway shall not be less than 30 inches(762 mm) high and 22 inches (559 mm) wide and not more than20 feet (6096 mm) in length when measured along the center-line of the passageway from the opening to the WATER passageway shall have continuous solid flooring not lessthan 24 inches (610 mm) wide. A level service space at least 30inches (762 mm) deep and 30 inches (762 mm) wide shall bepresent at the front or service side of the WATER heater. The clearaccessopening dimensions shall be a minimum of 20 inches by30 inches (508 mm by 762 mm) where such dimensions arelarge enough to allow removal of the WATER Seismic Clearances for maintenance and shall be provided withaccessfor inspection, service,repair and replacement without disabling the function of afire-resistance-rated assembly or removing permanent con-struction, other appliances or any other piping or ducts not con-nected to the appliance being inspected, serviced, repaired orreplaced.

5 A level working space at least 30 inches deep and 30inches wide (762 mm by 762 mm) shall be provided in front ofthe control side to service an WATER HEATERS installed in HEATERS shallbe installed in accordance with the manufacturer s installationinstructions, which shall be available on the job site at the timeof Cold WATER line cold waterbranchline fromthe main WATER supply line to each hot WATER storage tank orwater heater shall be provided with a valve, located near theequipment and serving only the hot WATER storage tank or waterheater. The valve shall not interfere or cause a disruption of thecold WATER supply to the remainder of the cold WATER valve shall be provided withaccesson the same floor levelas the WATER heater method of connecting a circulat-ing WATER heater to the tank shall provide proper circulation ofwater through the WATER heater.

6 The pipe or tubes required forthe installation of appliances that will draw from the water2010 FLORIDA BUILDING CODE or storage tank shall comply with the provisions of thiscode for material and 504 SAFETY Antisiphon , such as a coldwater dip tube with a hole at the top or a vacuum relief valveinstalled in the cold WATER supply line above the top of theheater or tank, shall be provided to prevent siphoning of anystorage WATER heater or Vacuum relief fed WATER HEATERS and bot-tom fed tanks connected to WATER HEATERS shall have a vacuumrelief valve installed. The vacuum relief valve shall complywith ANSI means for disconnecting an electric hotwater supply system from its energy supply shall be providedin accordance with CHAPTER 27 of theFlorida Building Code,Building.

7 A separate valve shall be provided to shut off theenergy fuel supply to all other types of hot WATER supply Relief storage WATER HEATERS operating aboveatmospheric pressure shall be provided with anapproved,self-closing (levered) pressure relief valve and temperaturerelief valve or combination thereof. The relief valve shall con-form to ANSI The relief valve shall not be used as ameans of controlling thermal valves shall be installed in theshell of the WATER heater tank. Temperature relief valvesshall be so located in the tank as to be actuated by the waterin the top 6 inches (152 mm) of the tank served. For installa-tions with separate storage tanks, the valves shall beinstalled on the tank and there shall not be any type of valveinstalled between the WATER heater and the storage shall not be a check valve or shutoff valve between arelief valve and the heater or tank Relief valve and pressure reliefvalves, or combinations thereof, and energy cutoff devicesshall bear the label of anapprovedagency and shall have a tem-perature setting of not more than 210 F (99 C) and a pressuresetting not exceeding the tank or WATER heater manufacturer srated working pressure or 150 psi (1035 kPa), whichever isless.

8 The relieving capacity of each pressure relief valve andeach temperature relief valve shall equal or exceed the heatinput to the WATER heater or storage Requirements for discharge dischargepiping serving a pressure relief valve, temperature relief valveor combination thereof shall:1. Not be directly connected to the drainage Discharge through anair gaplocated in the same roomas the WATER Not be smaller than the diameter of the outlet of thevalve served and shall discharge full size to theair Serve a single relief device and shall not connect to pip-ing serving any other relief device or Discharge to the floor, to the pan serving the waterheater or storage tank, to a waste receptor or to the Discharge in a manner that does not cause personalinjury or structural Discharge to a termination point that is readily observ-able by the building Not be Be installed so as to flow by Not terminate more than 6 inches (152 mm)

9 Above thefloor or waste Not have a threaded connection at the end of such Not have valves or tee Be constructed of those materials listed in or materials tested, rated andapprovedfor suchuse in accordance with ASME Required WATER HEATERS or hot WATER storagetanks are installed above the ground floor space, in attics orceiling areas, or within the habitable space, the tank or waterheater shall be installed in a galvanized steel or other metal panof equal corrosion resistance having a minimum thickness ofnot less than inch ( mm) (No. 24 gage), or otherpansapprovedfor such use. Electric WATER HEATERS shall beinstalled in a metal pan as herein required or in a high-impactplastic pan of at least inch ( mm) Pan size and pan shall be not less than11/2inches (38 mm) deep and shall be of sufficient size andshape to receive all dripping or condensate from the tank orwater heater.

10 The pan shall be drained by an indirect wastepipe having a minimum diameter of3/4inch (19 mm). Pipingfor safety pan drains shall be of those materials listed inTable Pan drain pan drain shall extendfull-size and terminate over a suitably located indirect wastereceptor or floor drain or extend to the exterior of the build-ing and terminate not less than 6 inches (152 mm) and notmore than 24 inches (610 mm) above the adjacent 505 INSULATION[E] Unfired vessel hot WATER storagetanks shall be insulated to (h ft2 F)/Btu ( m2 K/W). FLORIDA BUILDING CODE PLUMBINGWATER HEATERSCHAPTER 6 WATER supply AND DISTRIBUTIONSECTION CHAPTER shall govern the materials, designand installation of WATER supply systems, both hot and cold, forutilization in connection with human occupancy and habitationand shall govern the installation of individual WATER supply Solar energy energy systems used forheating potable WATER or using an independent medium forheating potable WATER shall comply with the applicable require-ments of this code.