Journeyman Plumber ExamWater Supply SystemsMedium
A plumber is installing a water distribution system in a commercial kitchen. The hot water supply to a dishwashing machine requires a minimum temperature of 180°F (82°C). The building's main water heater only supplies water at 140°F (60°C). What type of water heater would typically be installed near the dishwashing machine to meet the required temperature?
- AA tempering valve.
- BA tankless coil water heater.
- CA point-of-use booster heater.
- DA solar water heater.
Show answer & explanationAnswer & explanation
Correct answer: C. A point-of-use booster heater.
A point-of-use booster heater is specifically designed to raise the temperature of already heated water from a central source to a higher temperature required by specific fixtures or appliances, such as commercial dishwashers, which often need water at 180°F for sanitization.
Why the other options are wrong
- A. A tempering valve (or mixing valve) blends hot and cold water to lower the temperature, not raise it.
- B. A tankless coil water heater is a type of water heater integrated with a boiler, providing domestic hot water, but it's not specifically for boosting an existing hot water supply to a higher temperature for a single appliance.
- D. A solar water heater uses solar energy to heat water, typically supplementing a main water heater, but it doesn't guarantee a specific high temperature boost for a single appliance.
Booster Water Heater
A water heater designed to elevate the temperature of pre-heated water from a central source to a higher, specific temperature required by an appliance or fixture.
- Common in commercial kitchens for dishwashers.
- Raises water temperature for sanitization.
- Typically electric or gas powered.
Memory trick: Dishwasher needs a boost, so a booster heater is the choice, not a roost.