Motels and Hotels

Much like designing a heating / hot water system for an apartment or dormitory, providing an adequate supply of hot water for the rooms in a motel or hotel is the up most importance. To prevent the potential of dissatisfied customers and guests, the hot water system should be properly sized to provide hot water in adequate supply.

Special design considerations:

• Many of the design considerations that applied to apartments and multi-dwellings in regards to recirculating lines, hot water storage and sizing also applies to motels and hotels.
  
• The designer should pay extra attention to those situations which the motel or hotel contains either garden tubs or whirlpool tubs in the rooms. In these applications the the hot water system must be able to rapidly fill the the tub while maintaining temperature.
  
• The designer should also noted additional needs that may be required for those establishments that cater to conventions or have a high occupancy rate.

General "Rules of Thumb" For Sizing

Motel/Hotels Number of units	Max. hour	Max. Day	Avg Day
20 unit or less	6.0 gal/unit	35.0 gal/unit	20.0 gal/unit
60 units	5.0 gal/unit	25.0 gal/unit	14.0 gal/unit
100 units or more	4.0 gal/unit	15 gal/unit	10.0 gal/unit

Hot Water Demand per Fixture Detail Sizing

Fixture	Gallons of water per hour per fixture (calculated at a final temperature of 140ºF)
Basins, private lavatory	2
Basins, public lavatory	8
Bathtubs	20
Showers	75
Service sink	30

Method of Sizing

1. Determine the number of fixtures required for the application and calculate the total hot water demand for those fixture.

Number of Fixtures x Gallons of Water per Hour per Fixture = Possible Maximum Demand

2. Determine the Probable Hot Water Demand for the application.

Probable Hot Water Demand = Possible Maximum Demand x 0.25

3. Compare the Probable Hot Water Demand with the 1st Hour Performance Ratings of the Phase III Indirect Water or with the Heat Master Direct Fired Water Heaters.

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