Commercial Hot Water Recirculation System Design

Demand circulation which relies on a circulation pump when hot water is needed.

Commercial hot water recirculation system design. The hot water tank has a magnesium or aluminum anode rod in the hot water tank which is designed to corrode to sacrifice itself to the steel in the hot water tank. A recirculation system is designed to make hot water available at the tap nearly instantly. The alpha 15 55 hwr d is a recirculation system that delivers hot water in homes at the push of a button and can save thousands of gallons of water each year. This is why they say don t cook with hot water.

The seasoned plumbing engineer will also pick up a few new ideas. In a traditional hot water recirculating system there is a dedicated return line for the hot water pipes which runs from the furthest bathroom or fixture back to the water heater. A hot water recirculating system may be a big investment for small families but it can be a great way to save money in a large household where hot water is in greater demand through a larger area. This series will be of value to engineers and designers who are new to our industry.

The demand recirculation pumps are supposed to shut off at 104 f. This return system design ensures that there is always hot water in the trunk or main line but it is essential that the hot water recirculation lines are as close to all fixtures as possible. To ensure delivery of heated domestic water at all fixtures within 1 3 seconds of opening a faucet or otherwise creating a demand. The goal is to reduce hot water wait time to 10 seconds or less which is considered acceptable for public lavatories.

The system includes an alpha 15 55 circulator pump with a permanent magnet motor a temperature sensor and two push button controls. It is also vital that all hot water pipes are insulated. In sensible plumbing fhb 216 master plumber dave yates addresses whole house plumbing design. The key to proper water heating system design is to correctly identify the quantity temperature and time characteristics of the hot water requirement.

A hot water recirculation system is designed to provide hot water to each of the home s hot water taps instantly. Single loop recirculation systemsfigure 1 4 the fundamental objectives of adding a recirculating function to a domestic hot water delivery system are. As a rule if it take more than 5 seconds for hot water to reach a faucet installing a recirculating pump could save you money in the long term. Near the water heater area a recirculating pump pulls the water from the furthest fixture back into the water heater creating a loop.

Deppmann monday morning minutes series will focus on the design of domestic hot water recirculation systems in the plumbing portion of the commercial and institutional building.