Laing SM-303-BSR Bronze Circulator Pump with Thermostat

SM-303-BSR Bronze Circulator Pump with Thermostat by LAING
Laing's Bronze Circulator Pump with Thermostat is rated for temperatures to 230°F and line pressures to 150 PSI. 33 watts, 1/2 inch sweat connections with a 6 foot wire with plug.

Laing SM-303-BSR Features:
• Low flow provides minimal flow velocities thereby reducing the effect of pipe erosion and noise caused by vibration.
• Rated for temperatures to 230°F and line pressures to 150 PSI.
• Requires only 33 watts of power.
• 1/2 inch sweat connections.
• 6 foot wire with plug.
• Dry run cutout provided on pumps for hot water recirculation.

Laing SM-303-BSR Material of Wetted Parts:
• Brass housing
• 316 Stainless Steel rotor and separating wall
• Noryl impeller
• Ceramic bearing ball
• Carbon graphite bearing cap
• EPDM o-ring

Laing SM-303-BSR Technical Data:
• Model: SM-303-B
• Volts: 115
• Cycle: 60
• Phase: 1
• Watts: 33
• Amps: 0.30
• Maximum Pressure: 150 PSI
• Maximum Temperature: 230°F
• Weight (lbs.): 2.5

Laing SM-303-BSR Application - Hot Water Recirculation (Laing Part Number: 6643)

Laing Recirculating Pumps - Operating Costs Savings Summary

Please Note; the following information below mentions various  Laing recirrculation pumps - not speciffically the pump that is offered on this page. 

 LAING THERMOTECH® recirc pumps have only one moving part--the rotor/impeller. The motor creates an electromagnetic field that balances and spins the rotor/impeller on a stationary bearing ball inside the pump cavity. The motor is fully encapsulated in resin, has no moving shafts or seals, and eliminates conventional wear that can generate noise. Like all seal-less centrifugal circulators, the pump cannot be run without water lubricating the bearing. The pump housing must be flooded before start-up and water must be maintained in the system during pump operation. The unique leak-proof integration of the motor and pump housing eliminates the need for conventional mechanical seals or other shaft sealing devices. These components are self-lubricating and require no external lubrication.

Laing Recirculating Pumps - Operating Costs Savings Summary

LAING RECIRC PUMPS

Operating Costs Savings Summary
Models SM-303-B and SMT-303-B Series
Circulating Pumps

Based on 3 bedroom home with 4 occupants, water heater 60 feet from farthest fixture, insulated copper ¾" hot water supply and ½" recirculating lines on conventional system with a Laing SMT-303-B Recirc Pump.

Gas Water Heater:

Electric Water Heater:

1. Based on Laing SMT-303. 33 watt recirculation pump with timer running 16 hours per day, 365 days per year.
2. Actual savings may differ from household to household depending on a variety of factors including water use habits, length of hot water supply line, number of home occupants, etc.

• Above summary based on study and analysis prepared by Edward Saltzberg and Associates, consulting mechanical engineers. Copies of this detailed analysis are available on request from Laing Thermotech, Inc.

Instant Hot Water Recirculation Systems - Facts You Should Know

• The Laing SM-303 model low flow/low energy circulator is the most ideally suited unit for conventional instant hot water recirculation systems for the following reasons:
• Require only less expensive 1/2" return lines rather than 3/4' lines.
• Even with 1/2" copper lines, flow velocities are kept well below the Copper Institute's recommended 5 ft./second velocity limit due to the SM-303's low flow output - insuring long, trouble-free copper piping life.
• Low flows combined with low energy pump motor (only 33 watts) insure maximum system operating savings as indicated in the attached.
• Using larger recirculation pump (65 watts or larger) results in a noisier operating system, having to use more expensive 3/4" recirculation lines or experiencing significantly reduced copper pipe life due to increased flows and velocities if 1/2" pipe is used, and seeing a significant reduction in annual system savings.
• The Laing ACT-303 undersink instant hot water pump system also offers instant hot water at all faucets availability without the need for the installation of a recirculation line - truly a real benefit for existing homes where a conventional system requiring recirculation lines would be impossible or unduly expensive to install.
• Other considerations relative to installation of instant hot water delivery systems:
• Water (and sewer) disposal savings can vary from home to home from 8,000 to as much as 20,000 gallons per year depending mainly on length of distance between the water heater to the farthest faucet and number of occupants in the home.
• Use of low flow shower heads and faucets required by a number of areas simply increases the wait for hot water to arrive at a particular faucet, therefore, further justifying the need for an instant hot water delivery system.
• For washing machines and dishwashers, hot water is available instantly when required rather than when the hot water finally arrives from the water heater, thereby improving the operating efficiency and effectiveness of these appliances.
• Once a non-insulated hot water line is fitted with say 130F it usually takes only 30 to 45 minutes for the water in this line to cool down to 80F or below when the system is dormant - thereby, again requiring the usual wait for hot water to arrive from the water heater to a particular faucet if no recirculation system is installed.
• Although the installation of a Laing instant hot water recirculation system provides specific economic benefits such as water savings, sewer savings, and water heater operating cost savings, over 80% of present users say their main motivation for installing such a system was the convenience and time savings associated with having hot water instantly available at the faucet. The operating cost savings is simply a plus.