10 Best Residential Boiler of December 2025

• Used Book in Good Condition

Cengage Learning

• SIX TOOLS IN ONE: (1) Combustion Analyzer for O2, CO, CO2 (Calculates Combustion Efficiency, Excess Air, Losses, CO Air Free); (2) Ambient Room Air Carbon Monoxide (CO) Leak Detector; (3) Draft Meter (Negative & Positive Draft); (4) Cracked Heat Exchanger Test; (5) Built–In Differential Digital Pressure Manometer and (6) Built–in Differential Thermometer for flue and ambient air.
• MUST-HAVE FOR HVAC TECHS: The S500-1 portable, multifunctional combustion gas analyzer helps you easily install, set up and properly service residential and light commercial boilers and furnaces to assure maximum combustion efficiency.
• COMPACT, EASY-TO-USE: With its one-button operation, the S500-1 is accurate, compact and easy-to-use, making it the ideal entry-level solution to monitoring your boiler and burner processes. Quick and easy intuitive menu with one–page Quick Reference Guide. Graphic display screen and backlight.
• ONE METER, MULTIPLE FUNCTIONS: The S500-1 Combustion Gas Analyzer measures, display, store and print combustion efficiency, O2, CO, CO2, along with all necessary temperature, draft, and pressure measurements. The S500-1 contains 12 programmed fuels and oils, including Bio–Fuel and outdoor air temperature measurement for ALL HIGH-EFFICIENCY & CONDENSING boilers, water heaters, furnaces, etc.
• IN THE BOX: S500-1 S500 Lite Kit: Analyzer w/ O₂, CO, CO₂, Efficiency, Excess Air, Draft, Pressure, Temp, Rechargeable Battery & AC Plug, 5’ FT Dual Hose, 12” Probe, Water Trap, ABS Case, Calibration Certificate, Operating Manual, Cheat Sheet, Calculations for High Efficiency & Condensing Systems (No Bluetooth or Smartphone Apps).

E Instruments

DEWALT

• One-piece construction, eliminating up to 11 threaded joints
• Unique 3-way ball valve for isolation of water pressure regulator and expansion tank from system pressure
• Drain port with integral ball valve for unloading pressure from waterside of expansion tank diaphragm for air charge servicing and maintenance. Drain port can also be used for a variety of system draining and filling operations.
• 0 to 30psi (0 to 87kPa) pressure gauge for convenient system pressure reference

Watts

• Lifetime warranty
• Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
• Never run out of hot water with an ECOSMART tankless water heater
• Patented Self Modulating Technology and design
• ECOSMART tankless water heaters are 99.8-percent energy efficient.Uniform Energy Factor:0.98

EcoSmart

Fire & Ice

• length: 16.00
• width: 0.75
• height: 0.75
• weight: 0.21

Hydrolevel

Independently Published

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