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Water heater

The installation drawings in this bulletin are typical. Check local code requirements for vacuum breaker devices and cold-water inlet check valves. If you install a check valve in any of these systems, you must install a thermal expansion tank.There are two methods of installation: series and parallel, means to pipe together with several apertures that make multiple connections. That is what man folding is all about.
Parallel Installation
Parallel installation uses heaters that are identical in input and storage capacity. Normally, parallel installation is used when there is a demand for large quantities of hot water over a short period of time, such as filling a large garden tub or back to back showers.
Equipment being equal, two or more heaters connected in parallel will deliver more hot water than the same heaters connected in series. In a parallel configuration, the hot water demand is taken equally from each unit.