[Save 15% & Dual Heat Exchanger] - With potential savings of 15% compared to non-condensing units, this condensing tankless water heater delivers outstanding 0.86 UEF efficiency, dramatically reducing energy usage and operational expenses. This performance is made possible by an innovative dual heat exchange system, which combines a corrosion-resistant stainless steel condensing heat exchanger with a highly conductive oxygen-free copper heat exchanger, captures and reuses waste heat that conventional units lose, to maximize heat recovery.
[5.28 GPM & 114,000BTU] - The ThermoMate instant hot water heater can supply two showers simultaneously, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. No waiting time, no cold water shocks.
🚚 FAST DISPATCH FROM OUR LOCAL US EAST COAST WAREHOUSE
condensing · 0.86 UEF
CZ480 Series: NG / LP
🔧 Select your fuel type from the dropdown above: Natural Gas (CZ480NG) or Propane (CZ480LP) – same 5.28 GPM & 0.86 UEF.
Engineered for the East Coast Climate. With the Atlantic storm season arriving and energy costs fluctuating, ThermoMate solves your biggest seasonal frustrations: soaring utility bills, extreme coastal winds, and freezing winter pipes. Upgrading your home this summer with our high-efficiency condensing technology secures endless hot water while maximizing your gas savings.
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0.86 UEF · Beat Inflation
Dual heat exchangers slash annual gas bills
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5.28 GPM Output
Run 2 showers + kitchen simultaneously
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Storm Resilient
360Pa DC fan resists hurricane-force winds
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Winter Ready
4 built-in ceramic heaters activate at 41°F
📊 ThermoMate Condensing Lineup
| Model |
Fuel |
GPM |
BTU |
UEF |
Connections |
Dimensions |
| CZ480NG |
Natural Gas |
5.28 |
114,000 |
0.86 |
3/4" NPT water · 1/2" gas |
21.65"x13.77"x7" |
| CZ480LP |
Propane |
5.28 |
114,000 |
0.86 |
3/4" NPT water · 1/2" gas |
21.65"x13.77"x7" |
Both models: 120V, indoor mount, 3" OD vent, includes installation kit & manual.
🔍 Condensing technology in detail
② HHV vs LHV efficiency
③ OFC primary heat exchanger
④ 7‑stage burner
⑤ DC fan 360Pa
⑥ SS condensing (reclaims waste heat)
⑦ ±1°F precision
⑧ 9 key benefits
⑨ Sizing guide
⑩ Connections & included items
CZ480NG shown
💧 Condensate: what you need to know
This condensing heater produces mildly acidic water (condensate) during operation. To protect your pipes, we strongly recommend installing an external condensate neutralizer kit (not included) at the drain point. Never drain into copper without neutralization. Many users overlook this – we want you to have a trouble‑free installation.
📦 Box contents & installation must‑haves
Included: Water heater, mounting bracket, manual, 5ft UL power cord, installation hardware.
Required separately: 150 psi pressure relief valve, 3" metal vent pipe (type depends on local codes), condensate neutralizer (recommended).
💡 Pro tip: Gas line must be sized correctly – if over 30ft, consider upsizing to 3/4" to maintain full BTU performance.
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Standard 3/4" NPT water · 1/2" NPT gas · 120V plug
🔥 Frequently Bought Together
Complete your summer plumbing upgrade safely with official ThermoMate accessories.
3" Vent Pipe Kit
Required for safe indoor exhaust. Perfectly matches your new water heater.
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Isolation Valve Kit
Highly recommended for annual descaling and protecting your investment.
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⭐ What owners are saying
⭐⭐⭐⭐⭐ “Instant hot water, endless showers. Be sure to add condensate neutralizer if you have copper pipes.” – letmepicyou
⭐⭐⭐⭐⭐ “Showers no longer run cold. Gas bill went down. Install needs pro but worth it.” – Tankless bliss
⭐⭐⭐⭐⭐ “Perfect for my cabin. Works flawlessly. Great build quality.” – Off The Grid Ken
❓ Quick answers
Why upgrade to condensing this summer? Summer is the ideal time for home renovations. Upgrading now prepares your home for the Atlantic storm season (our 360Pa DC fan resists hurricane-force winds) and ensures you maximize your gas savings before winter heating bills hit.
How does condensing save energy? It captures heat from exhaust gases that would otherwise be lost, preheating cold water. That’s why UEF reaches an ultra-efficient 0.86.
Will it work in cold climates? Yes, with built-in freeze protection down to 41°F. For extreme cold, ensure proper indoor installation.

⭐ CSA certified · 2‑year warranty · US‑based support · Condensing technology for maximum savings
⚡ Professional installation recommended. Specifications subject to change.
condensing tankless water heater | natural gas | propane | 5.28 GPM | 0.86 UEF | high efficiency | whole house | indoor | instant hot water