ThermoMate CZ422NG Natural Gas Tankless Water Heater Indoor 5 GPM 113,000 BTU Instant Hot Water

The ThermoMate CZ422NG is a high-performance natural gas tankless water heater designed for whole-house indoor installation, delivering instant hot water on demand without the wait or space requirements of traditional tank models. With a maximum flow rate of 5 gallons per minute and 113,000 BTU output, this tankless instant water heater provides continuous hot water for two simultaneous showers while maintaining precise temperature control. Ideal for busy households seeking energy-efficient, reliable hot water, this unit combines smart sensor technology with comprehensive safety features and compact design. CSA-certified and equipped with advanced diagnostics, it represents a modern solution for residential hot water needs.

Highlights

• Powerful 5 GPM Flow Rate – Delivers 113,000 BTU heating capacity to supply two showers simultaneously with stable 105°F water temperature based on 65°F inlet temperature, eliminating cold-water interruptions
• Precision Temperature Control – Smart flow sensor and control chip adjust heating 20,000 times per second, maintaining ±1°F temperature consistency for unmatched comfort
• Superior Energy Efficiency – Achieves up to 98% thermal efficiency with 0.81 UEF rating, reducing energy waste and lowering annual operating costs by approximately 30% compared to traditional water heater models
• Compact Space-Saving Design – Measures only 21″H × 13″W × 7″D, occupying less than one-third the space of conventional tank water heaters for flexible installation options
• Comprehensive Safety Features – CSA-certified with nine protection systems including boil-dry, freeze, flame-out, overheat, over temperature, timeout, pipe blockage, high-temperature lock, and excessive air pressure safeguards
• Simple Installation Process – Standard 3/4″ NPT water inlet/outlet connections, 1/2″ NPT gas inlet, 3″ OD vent, and UL-approved 120V plug simplify setup in most residential applications
• Smart LED Display – 3.5-inch display enables easy temperature adjustment from 90–140°F and monitors flow, fan, and flame status with advanced error codes for fast troubleshooting
• Durable Heat Exchanger – Oxygen-free copper construction ensures efficient heat transfer and superior corrosion resistance for long-lasting performance

Technical Details

• Brand: thermomate
• Model: CZ422NG
• Fuel Type: Natural Gas
• Maximum Flow Rate: 5 GPM
• BTU Output: 113,000 BTU
• Thermal Efficiency: Up to 98%
• UEF Rating: 0.81
• Temperature Range: 90–140°F
• Temperature Precision: ±1°F
• Freeze Protection Activation: 41°F (5°C)
• Dimensions: 21″H × 13″W × 7″D
• Water Connections: 3/4″ NPT inlet/outlet
• Gas Inlet: 1/2″ NPT
• Vent Diameter: 3″ OD
• Power Supply: UL-approved 120V plug
• Display Size: 3.5 inches LED
• Color: Metallic Silver
• Certification: CSA
• Installation Type: Indoor, whole house

All prices incl. VAT, plus shipping.