Water Werks Hot Water Recipe


When using commercial water heaters, it is dangerous and sometimes against code, to supply hot water at 180 degrees Fahrenheit directly to the fixtures in your facility. All hot water for general use needs to be mixed down to 140 degrees Fahrenheit. Any of the major water heating equipment manufactures can provide suggestions for the most effective method of delivering safe hot water to your particular situation. Exception: WaterWerks Showers are equipped with integral thermostatic water controllers that do not require pre-mixed hot water. These mixing valves are designed with a safety feature that allows the user to pre-set a maximum temperature that cannot be exceeded.

Typical Hot Water Recommendations for WaterWerks Showers:

Based on 104 degrees Fahrenheit water temperatures at the showerhead with all showerheads in operation. It should be noted that service protocols vary significantly from one spa location to another. In most cases, all available showerheads are not running the entire time the service is being conducted. A primary concern for any spa making the commitment to offer quality hydrotherapy treatments is the consistent availability of sufficient hot water. In fact, failure to provide a sufficient hot water supply is one of the most frequent and costly mistakes made in the planning of hydrotherapy rooms. By providing answers to the following questions, you will be able to present to your plumber contractor, architect or mechanical engineer a clear picture to ensure the accurate prediction of what your individual hot water requirements will be in order to facilitate water heater sizing.

Questions you need to ask before you install your hydrotherapy equipment.
How Hot?

How Much?

  • How much water does each fixture consume? Each fixture will have a maximum flow rated in gallons per minute (gpm). If you can't find it printed on the fixture it should be indicated in the manual or instructions. If you are still unsure, consult the manufacturer.
  • How many minutes will each fixture be running per hour? For example; a shampoo bowl might be used twice in an hour with the water turned on for 5 minutes each time. A vichy shower might be on for a total of 15 minutes each hour on very busy days.
    For hydrotherapy tubs, pedicure spas, etc... what is the water capacity and how often will it be filled in an hour?
  • Total your answers (1-3) to find your peak need. This figure will be the amount of mixed hot water that your particular spa will require at any given time.

  • There are two approaches (plus combinations of the two) to ensuring that enough hot water is always available. One is to use a water heater(s) with a fast recovery rate to keep up with the demand (recovery time is the time it takes the hot water heater to heat more water to the desired temperature). The other is to provide a thermal storage tank(s) in order to have enough reserved hot water for the peak usage times.

    Some Tips: