We continue this series with a discussion on verifying that temperature controls in a domestic hot water system are working properly. TMVs work well at stabilizing system temperatures. When used with point-of-use mixing valves, they provide safe temperatures for bathing and washing.

Previous sizing practices have routinely overestimated the required capacity of domestic water heating systems, relying on the Modified Hunter’s Curve to determine water systems sizing. Data-driven engineering, however, helps building owners and managers achieve new levels of safety, efficiency and cost/space savings for occupant needs.

In part 4 of commissioning/troubleshooting domestic hot water systems, Ron George discusses how long it takes hot water to get to all fixtures, temperature limit stops, water heater thermostats, digital mixing valves, water flow velocity, and balancing water conservation with health and safety.

What is Performance Conditions? What is the re-circulation system with dual temperature requirements? Norm Hall will answer all in MMM.

Are you looking for Plumbing Topics? Want to know more about what happen when Addition of a Mixing Valve? Read Monday minute blog.

Part 3 of this series covers applications and locations for various temperature controls, DHW control valves, temperature control valve standards, and how to protect yourself from liability if the owner refuses to install a control valve serving the hot water distribution system.

Domestic water recirculation systems have low flow and low head pumps. What happens in a high rise with pressure reducing valves in the hot water supply?

Proper design of domestic water systems and use of standards are key to mitigating Legionella bacteria in facilities.

Determine the pressure drop of the longest run or zone pipe and add any equipment pressure drops at the recirculation flow rate.