LAARS MIGHTY THERM ® Copper-Finned Gas-Fired Volume Water Heaters

LAARS MIGHTY THERM ® QUIET, EFFICIENT, SPACE-SAVING Greater energy efficiencies as Integral finned copper tubes Controls meet requirements of meeting ASME specification SB through state-of-the-art design. 75 are rolled directly into Efficient heat transfer and headers. Heat exchanger baffles standards and include ignition reduced standby losses result in safeguard, manual reset high lower operating costs. tubing configuration extract limit, operating temperature combustion heat with maximum control, gas pressure regulator, (International Approval Services, redundant electric gas valve a joint...

STANDARD FEATURES • • • • • • • • • • • • • • • • • No fire-side gasketing Slide-out burner tray (sizes 175-1825) Flanged connections 160 PSI working pressure Constructed to Section IV, ASME Boiler and Pressure Vessel Code Factory mounted pump (sizes 175-1825, Models IW & PW) Design certified and tested by I.A.S. (A.G.A. & C.G.A.) Meets requirements of ASHRAE Standard 90.1 Electronic flame supervision Natural or propane gas Electronic ignition, standard on sizes 500 and above Pilot gas regulator On/off switch with indicator light Over-current circuit protection Non-combustible base - standard...

DIMENSIONAL AND SIZING DATA INDOOR MODELS Indoor Size Water Conn. Size inches NPT OUTDOOR MODELS Outdoor Size Water Conn. Size inches NPT Input and output must be derated 4% per 1000 feet above sea level when installed above 2000 feet altitude. Dimensions are nominal. Units with pumps: Add 20 lbs. (9 kg) to sizes 175-400 and 55 lbs. (25 kg) to sizes 500-1825. When two gas connection sizes are shown, the smaller applies to the standard gas train, while the larger applies to optional trains, such as four stage or motorized gas valves. Consult factory for exact specifications.

DIMENSIONAL DIAGRAMS Inlet Outlet * Cast Iron 5%, Bronze 23A INDOOR OUTDOOR Dimensions shown are inches cm.

RECOVERY TABLES INDOOR MODELS Required Water Temperature Rise Indoor Size Outdoor Size Required Water Temperature Rise Input and output must be derated 4% per 1000 feet above sea level when installed above 2000 feet altitude. Dimensions are nominal. Units with pumps: Add 20 lbs. (9 kg) to sizes 175-400 and 55 lbs. (25 kg) to sizes 500-1825. When two gas connection sizes are shown, the smaller applies to the standard gas train, while the larger applies to optional trains, such as four stage or motorized gas valves. Consult factory for exact specifications.

PUMP REQUIREMENTS GUIDE A suitable pump must be field-provided for circulation of water between Model VW heater and the storage tank(s). The pump must be sized to provide adequate temperature rise through the heater, while producing correct flow for prevailing water hardness conditions. Specifications in this table include allowance for 30 ft. (9.1 m) of piping and normal fittings between heater and tank. This allowance is based on flange connection size (see chart). Flow Rate Size Indoor Outdoor Head Loss Flow Rate Head Loss Water Conn. Size Temp. Rise Across Heater ˚F Sizes 1200, 1430, 1670...

MODELS AVAILABLE Model VW Volume Water Heater Volume Water Heater with Pump Instantaneous Volume Water Heater Completely assembled at the factory and simple to install. Sizes 175,000 to 400,000 BTU/hr. (51.3 to 117.2 kW) are combination indoor/ outdoor. Sizes 500,000 to 5,000,000 BTU/hr. (146.5 to 1465.0 kW) can be ordered either indoor or outdoor. Both series are used in conjunction with storage wherever a large volume of hot water is required, such as apartments/condominiums, hotels, schools, hospitals and laundries. The addition of a factory mounted and matched pump provides installation and...