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WHITE PAPER

Recommended Installation Practices for Residential Tankless Water Heaters to Reduce the Danger of Scalding

The ASSE International Scald Awareness Task Group was formed to educate and give guidance to the general public and plumbing industry on scald hazards associated with hot water. This white paper focuses on the recommended installation practices that plumbers, installers, and/or plumbing contractors should follow to reduce the dangers of scald injuries or thermal shock when installing any type of residential tankless water heater.

This paper also addresses some of the potential problems with poor, unprofessional installations and the solutions to those problems. The paper also points out the responsibilities of the installer.

With the advent of tankless water heater technology that can control the outlet temperatures of the water heater to the same specifications as various ASSE International product performance standards for mixing valves, ASSE International developed three new ANSI Approved product performance standards. Two of these standards will be featured in this paper:

  • ASSE Standard #1082-2018, Performance Requirements for Water Heaters with Integral Temperature Control Devices for Hot Water Distribution Systems
  • ASSE Standard #1084-2018, Performance Requirements for Water Heaters with Temperature Limiting Capacity

ASSE International strongly encourages industry professionals, associations, educators, members of the media, and those with a desire to help protect public safety to join ASSE in disseminating this latest white paper.

Recommended Installation Practices for Residential Tankless Water Heaters to Reduce the Danger of Scalding, along with the task group’s five previous scald awareness white papers —Recommended Installation Practices for Residential Storage Type Water Heaters to Reduce the Danger of Scalds, Scald Hazards Associated with Low-Flow Showerheads, Understanding Potential Water Heater Scald Hazards, Adjustment of Automatic Compensating Valves to Prevent Potential Scald Hazards, and Guidelines for Temperature Control Devices in Domestic Hot Water Systems — may be viewed and downloaded HERE

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Adaptive Reuse: Converting Offices to Multi­Residential Family

Adaptive reuse of commercial office spaces to residential multifamily offers opportunities to ease some of the housing shortage in the US. These types of construction projects have many challenges, from zoning restrictions, financing, and also controlling construction costs. Construction costs specifically can have a disparate impact on whether an adaptive reuse project is possible, let alone successful. Therefore, flexibility during the construction process is vital to the success of an adaptive reuse project. Codes for plumbing and mechanical systems that support design versatility and science-based methods, such as the Uniform Codes, will be essential for controlling construction expenses.

Capacities of Stacks and Horizontal Drains in Storm Drainage Systems

The sizing for storm drainage systems are dependent upon flow capacity equations used to calculate velocities and flow rates in pipe conduits. One of the variables in the equations is the coefficient of roughness. This paper explores how the roughness of different types of material will change the computational results that are dependent upon the roughness coefficient of the pipe.

Increase in Flow Diversity From Simultaneous Fixture Use: Impact on Peak Flow Estimate

In calculating peak water demand, there can be instances where an increase in fixture count results in a decrease in the expected peak demand. This white paper explains why this counterintuitive result can occur, especially when there is some probability of stagnation (i.e., zero demand). Using IAPMO’s Water Demand Calculator (WDC), we are not designing with zero flow in mind; hence, zero flows are ignored, and the 99th percentile is extracted from actual flows for any combination of busy fixtures.


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