ThermoMate CZ422NG | 113,000 BTU 4.22 GPM Natural Gas Tankless Water Heater

Consistent 4.22 GPM & 113,300 BTU – Enough for 2-4 Fixtures at Once

No more waiting for the tank to refill. The ThermoMate CZ422NG delivers unlimited hot water simultaneously for two showers and a dishwasher. Perfect for busy American households. Advanced flow sensor triggers instant heating the moment you open a tap — zero cold water sandwich effect. Say goodbye to running out of hot water mid-shower.

Oxygen-Free Copper Heat Exchanger: Max Efficiency & Durability

Unlike cheap stainless steel units that corrode and waste heat, our oxygen-free copper exchanger achieves 98% thermal efficiency (UEF 0.81). Copper transfers heat faster, reduces gas consumption, and resists scaling. You'll save up to 30% on annual energy bills compared to traditional tank heaters or basic stainless steel tankless models.

Multi-Stage Gas Burner – Smooth Modulation

Engineered for precise temperature control, the multi-stage burner ramps heat output seamlessly from low to high demand. No sudden spikes — just consistent hot water from 90°F to 140°F. Perfect for delicate appliances and family safety.

Powerful DC High-Speed Fan (360Pa / 3000 RPM)

Ensures complete exhaust evacuation and stable combustion even with long vent runs.

Built for Extreme Weather – Hurricane-Proof Wind Resistance

Worried about high winds causing flameouts? Our unit is engineered with a sealed combustion system and DC fan that can withstand major hurricane winds (Category 3+, 111 mph). No backdraft, no safety shutdown — reliable hot water during storms.

8 Layers of Safety – Peace of Mind for Your Family

• Boil-dry protection & Freeze protection (down to -22°F)
• Flame failure device & Overheating protection
• Over temperature & Timeout protection (60min auto shut-off)
• Pipe blockage detection & High-temperature lock & Excessive air pressure protection

Certified to UL standards, meets rigorous North American safety requirements.

Smart Diagnostic Display – Real-Time Insights

Monitor water flow, flame status, fan RPM, and output temperature on the crisp 3.5” LED touchscreen. Integrated error code technology quickly identifies issues, simplifying troubleshooting. Adjust temp between 90°F-140°F with a tap. UL-certified 120V plug ensures continuous monitoring.

Library-Quiet Operation – No More Rumbling

Say goodbye to noisy tank heaters. Our advanced burner and DC fan operate at whisper-quiet levels (<45 dB) — install near living areas or bedrooms without disturbance.

±1°F Precision – End Annoying Temperature Fluctuations

Unlike competitors that cause sudden cold bursts, the ThermoMate microprocessor adjusts gas and water flow 20,000 times per second. Keeps your shower within ±1°F even when another tap opens. No more jumping out of the water stream.

Which Model Fits Your Home? Sizing Guide by US Region

Southern States (warmer ground water): CZ422NG (4.22 GPM) comfortably handles 2-4 fixtures.
Northern States (cold incoming water): Use dual units or consider our higher BTU series for larger families. This CZ422NG with 113,000 BTU works great for 3-bath homes in moderate climates.
Peak Demand: Calculate GPM (shower 1.5-2 GPM + faucet). For whole house up to 4 fixtures simultaneously, this unit is optimal. Check temperature rise chart in images.

Easy Installation – Everything You Need (Almost)

Included in box: ThermoMate CZ422NG unit, mounting bracket, screws kit, 3” OD vent adapter, manual, and 5ft UL power cord.
Connections: Standard 3/4” NPT water inlet/outlet, 1/2” NPT gas inlet — compatible with most US homes.
*Required separately: 150 psi pressure relief valve, 3-inch metal exhaust pipe for venting. Compact size: 21.65”H x 13.77”W x 7”D fits in tight spaces.

Save installation cost with standard fittings; no need for complex adapters.

❓ Can a tankless water heater supply multiple showers at once?

Yes! This ThermoMate 4.22 GPM unit can handle 2 showers simultaneously (each at ~1.8 GPM) plus a faucet. In warmer climates, it may support 3 fixtures. Check incoming water temp — our unit modulates perfectly.

❓ Are tankless water heaters energy efficient?

Absolutely. ThermoMate achieves UEF 0.81 and 98% thermal efficiency, leading to up to 30% annual energy savings compared to storage tank heaters.

❓ What about installation parts?

You'll need a 150 PSI pressure relief valve (not included) and a 3” diameter metal exhaust pipe for venting. All water/gas connections are standard NPT. Professional installation recommended but DIY-friendly for experienced users.

❓ How does it perform in freezing climates?

Built-in freeze protection activates when internal temp drops, preventing pipe bursts. Suitable for indoor installation in all US states.

Technical Specifications