Switching to an HPWH may be more difficult depending on location of the existing unit and whether there is adequate space for proper venting and, if switching from a gas unit to a HPWH, will rerouting of gas lines and changes to venting be needed. Existing piping will also need to be rerouted to meet the needs of the HPWH as well.
Verifying code compliance for HPWHs would typically be at the mechanical rough-in, electrical, and final inspection stages. Construction or work is to remain accessible and exposed for inspection purposes until approved. Required inspections include footing and foundation, framing and rough-in work, plumbing rough-in, mechanical rough-in, and final inspection.
Further details are provided for inspections regarding foundation, plumbing, mechanical, gas and electrical, floodplain, frame and masonry, and final inspection. Any additional inspections are at the discretion of the building official.
Inspections should provide verification with the following items if specified and approved on the construction documents and per manufacturer specifications and installation:. This section provides additional related information and references to materials that are applicable to this provision. This code for residential buildings creates minimum regulations for one- and two-family dwellings of three stories or less.
It brings together all building, plumbing, mechanical, fuel gas, energy, and electrical provisions for one- and two-family residences. A new federal standard for the minimum allowable EFs for residential water heaters became effective on April 16, Water heaters manufactured prior to April 16, , had to comply with the previous federal standard, which had been in effect since January 20, Under the previous standard, electric storage water heaters with a rated storage volume RSV [4] of gallons were required to have a minimum EF of:.
For a typical gallon electric storage water heater, the minimum EF under the previous standard was 0. For an gallon electric storage water heater, the minimum EF was: 0.
Under the new federal standard, electric storage water heaters with an RSV of gallons must have a minimum EF of:. For a typical, gallon water heater, the minimum EF is 0. Department of Energy, Building Technologies Office.
Residential Water Heaters. Table 2. Plan Review. The building official has authority to render interpretations of this code and to adopt policies and procedures in order to clarify the application of its provisions.
Such interpretations, policies, and procedures shall conform to the intent and purpose of this code. The building official is permitted to approve an alternative material, design, or method of construction in cases where the building official finds that the proposed design is satisfactory and complies with the intent of the provisions of this code, and the material, method, or work offered is for the purpose intended, and not less than the equivalent of that prescribed in the code.
Section R Whenever there is insufficient evidence of compliance with the provisions of this code, or evidence that a material or method does not conform to the requirements of this code, or in order to substantiate claims for alternative materials or methods, the building official has authority to require tests as evidence of compliance to be made at no expense to the jurisdiction. Test methods shall be as specified in this code or by other recognized test standards.
In the absence of recognized and accepted test methods, the building official shall approve the testing procedures. Tests shall be performed by an approved agency.
Reports of such tests shall be retained by the building official for the period required for retention of public records. Construction documents should be of sufficient clarity to indicate the location, nature, extent of the work proposed, and show in sufficient detail pertinent data and features of the system.
Construction documents should include: HPWH system design criteria Equipment type s , size s , and efficiencies Location of the HPWH Mechanical and service hot water piping design, heat traps on inlet and outlet lines to prevent thermo-siphoning, and installation specifications Protection of piping exposed to outdoor elements Installation specification of ducting the exhaust and air intake, and duct insulation and sealing Condensate drain line installation specifications depending on location, some systems could require a condensate pump Operating temperature of fluids to be transported connected to mechanical system and service hot water system Equipment and system controls Electrical wiring methods and design, connections, grounding, and installation specifications [most manufacturers require a VAC single phase 30 amp power supply for HPWHs].
Water heaters should be installed in accordance with Chapter 28, Water Heaters, manufacturer instructions and requirements of the code.
Chapter 28, Water Heaters Section P Supplied with plumbing fixtures and appliances intended for bathing, washing, or culinary purposes. Section P Drain valves for emptying the tank, installed at the bottom of tank-type water heater and hot water storage tank.
Water heaters to be installed in accordance with this chapter and Chapters 20 Section M and 24 Fuel Gas is applicable. Water heaters and storage tanks should be installed in accordance with Section M and should be located and connected to provide access for observation, maintenance, servicing, and replacement.
Section M A level working space not less than 30 inches deep and 30 inches wide millimeters by millimeters must be provided in front of the control side to service an appliance. Check manufacturer installation instructions.
HPWHs typically require more working space than code. Equipment and applications supported from the ground should be level and firmly supported on a concrete slab or other approved material extending not less than 3 inches 76 millimeters above the adjoining ground.
Appliances suspended over the floor should have a clearance of not less than 6 inches millimeters from the ground. Most manufacturers require the water heater to be elevated from the floor at least 18 inches and on a proper platform capable of supporting the combined weight of the water heater and water. Water heaters having an ignition source should be elevated so the ignition source is not less than 18 inches millimeters above the garage floor currently not relevant to HPWHs ; refer to manufacturer specifications for installing HPWHs in garages.
The tank should be installed in a pan constructed of one of the following: Galvanized steel or aluminum of not less than 0. The pan drain should extend full size and terminate over a suitably located indirect waste receptor or should extend to the exterior of the building and terminate not less than 6 inches and not more than 24 inches above the adjacent ground surface.
Appliances and equipment used for heating water or storing water hot water should be protected by one of the following two valve types: A separate pressure-relief valve and a separate temperature relief valve A combination pressure- and temperature relief valve. Pressure-relief valves should have a relief rating adequate to meet the pressure conditions for the appliances or equipment protected.
In tanks, valves should be installed directly into a tank tapping or in a water line close to the tank. They should be set to open at not less than 25 psi kPa above the system pressure but not over psi kPa. The relief-valve setting should not exceed the rated working pressure of the tank. Temperature relief valves should have a relief rating compatible with the temperature conditions of the appliances or equipment protected. The valves should be installed such that the temperature-sensing element monitors the water within the top 6 inches millimeters of the tank.
A check or shutoff valve should not be installed in the following locations: Between a relief valve and the termination point of the relief valve discharge pipe.
Between a relief valve and a tank. Permits add an additional layer of protection and assurance that your system is installed correctly and will operate safely. Our installation experts pull permits for all heating and cooling system installations. No matter what county you live in, our professional installers and permitting staff will make sure your project goes without a hitch.
We explain every step of the process to you and make sure you get the equipment you want when you want it.
Unfortunately, you are not in our service area. Get an Estimate We can't wait to make your home great. Street Address City State Zip. Morning Afternoon. Sign me up. This field is for validation purposes and should be left unchanged. The passageway from the appliance to the opening must be unobstructed and large enough to remove the appliance, with continuous solid flooring a minimum of 24 inches wide and maximum of 20 feet long.
There are two exceptions to the passageway requirements. The passageway floor is not necessary if the appliance can be serviced from the attic access opening and, when the passageway to the appliance is unobstructed and not less than 6 feet high and 22 inches wide for its entire length, it can be as long as 50 feet.
A luminaire light fixture and receptacle must be installed near the appliance. The luminaire should be controlled by a switch near the attic access opening. Recent Blogs Does a home inspector check toilets? Water Heaters. Water Heater Age. Septic Tank Systems. Structure and Rooms. Plumbing Pipes. When It First Became Code.
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