Mizudo CS120S Tankless Water Heater Natural Gas 5.1 GPM 120,000 BTU New - FDG-CS120SBW-NG
This Mizudo tankless water heater is designed for outdoor installation. Powered by natural gas, it provides continuous hot water to multiple points through your home. The heat exchanger quickly heats the water to a maximum of 149°F, eliminating the wait for water to heat up. The bottom built-in forced DC fan eliminates the influence of external wind, ensuring stable combustion, safety, energy efficiency, and no pollution.
What our Experts Think
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Reliable on‑demand hot water
The Mizudo CS120S Tankless Water Heater Natural Gas 5.1 GPM 120,000 BTU New delivers continuous hot water instantly without a storage tank — meaning no waiting for heat and reduced energy waste compared with traditional tank heaters. Its 120,000 BTU output with up to 5.1 GPM flow comfortably supports multiple fixtures at once in many homes.
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Outdoor‑ready & space‑saving design
Built for outdoor wall‑mounted installation, this tankless unit frees up interior space and replaces bulky storage tanks with a compact profile suited to yards or exterior walls.
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Energy‑efficient performance
With a UEF above 0.81, it operates efficiently, saving on heating fuel while providing stable hot water delivery — a strong choice for cost‑aware homeowners.
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Precise temperature control
Digital controls and precise sensing help keep hot water within a narrow temperature range, delivering consistent heat (typically 95–149 °F) with minimal fluctuation.
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Durable & weather‑adapted
Designed with weather resistance and reliable combustion control, it’s engineered to withstand outdoor conditions, though professional installation is recommended for safety and performance.
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Easy installation & standard connections
Standard ¾″ NPT water and gas connections make it compatible with common plumbing setups, simplifying installation for qualified technicians.
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Suitable for everyday households
Experts recommend this unit for small‑to‑medium homes or outdoor applications where on‑demand hot water is desired without the footprint of a tank heater — great for showers, sinks, and general hot water demand with efficient, continuous supply.
Q&A
Q: What is this water heater designed for?
A: A natural gas‑powered tankless water heater delivering continuous hot water without a storage tank — ideal for residential outdoor installations.
Q: What is its hot water output capacity?
A: Up to 5.1 GPM (gallons per minute) at 120,000 BTU heating capacity, suitable for supplying hot water to multiple fixtures like showers and faucets.
Q: Where can it be installed?
A: For outdoor installation only (wall‑mounted), with standard 3/4″ NPT gas and water connections.
Q: What is the energy performance rating?
A: Features a Uniform Energy Factor (UEF) over 0.81, offering efficient hot water delivery and reduced gas usage compared with older tank systems.
Q: How is the temperature controlled?
A: Precise electronic temperature control typically allows adjustment between approx. 95 °F–149 °F for customized comfort.
Q: Does it support multi‑fixture use?
A: Yes — at up to 5.1 GPM it can handle several hot water outlets simultaneously, depending on inlet water temperature and demand.
Q: What safety and durability features are included?
A: CSA certification ensures compliance with safety standards for outdoor gas water heaters.
Q: Is it easy to install and maintain?
A: The compact, wall‑mounted design simplifies outdoor setup; professional gas and water line connection is recommended for safety and code compliance.
Maintenance Tips
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Annual Professional Check: Have a licensed technician inspect and service the heater at least once per year to ensure safe gas operation and efficient performance.
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Clean Inlet Filter: Periodically (e.g., during annual service) remove and rinse the water inlet filter to clear debris and maintain flow.
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Descale Heat Exchanger: In areas with hard water, flush and descale the heat exchanger annually to reduce mineral buildup and preserve heating efficiency.
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Check Exterior Area: Keep the outdoor installation free from dirt, plants, clotheslines, and flammable materials to ensure proper air intake and ventilation.
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Verify Gas & Water Connections: Inspect gas and water lines for leaks or corrosion; tighten connections as needed and ensure correct gas type/pressure per manual.
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Monitor Performance & Errors: If water temperature fluctuates, flow decreases, or error codes appear, call a qualified technician without delay.
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