Mizudo CS120 Tankless Water Heater Natural Gas 5.1 GPM 120,000 BTU New - FDG-CS120BW-NG
The CS120 natural gas tankless water heater provides a compact and efficient solution for your home's hot water needs. With a maximum temperature of 149°F and a flow rate of up to 5.1 GPM for 40 minutes, this unit can supply nearly 300 gallons of hot water. Its precise temperature control ensures consistent comfort, adjustable from 95°F to 149°F. Designed for indoor installation, this tankless heater is compatible with most existing vents and pipes, making it an ideal choice for medium to smaller homes with 1-2 bathrooms.
What our Experts Think
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Efficient on‑demand hot water delivers up to 5.1 GPM with 120,000 BTU power — enough for 2–4 fixtures at once depending on inlet water temp.
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Tankless design means no waiting for a tank to reheat — continuous hot water whenever needed.
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Compact wall‑mounted unit saves space compared to traditional tank heaters (~¼ the footprint).
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Precise digital temperature control (typically 95–149 °F) ensures consistent output.
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CSA certified with >0.81 UEF efficiency helps reduce gas usage and energy waste.
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Easy installation compatibility with standard ¾″ NPT gas/water connections.
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Best suited for small‑to‑medium homes or supplemental hot water for kitchens/bathrooms.
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Consider gas line size and inlet temp — flow and temp rise depend heavily on fuel supply and cold water conditions. (General tankless tip)
Q&A
Q: What kind of water heater is this?
A: A natural gas tankless water heater that delivers on‑demand hot water without a storage tank, making it more efficient and space‑saving than traditional tank heaters.
Q: What is its hot water flow rate?
A: Up to 5.1 GPM (gallons per minute), suitable for multiple fixtures like showers and sinks running at once in many homes.
Q: How much heating power does it have?
A: 120,000 BTU heating capacity provides strong output for consistent hot water.
Q: What temperature range can it deliver?
A: Adjustable hot water from about 95°F to 149°F for comfortable heating.
Q: Where can it be installed?
A: Designed for indoor installation, mounting on a wall and compatible with standard vents and pipes.
Q: How does tankless design benefit me?
A: Provides instant, continuous hot water without waiting for a tank to heat up, and typically lasts longer than tank water heaters.
Q: Is it compact and easy to install?
A: Yes — compact, wall‑mounted design saves space compared to traditional tank systems
Maintenance Tips
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Annual flush/descale: Perform a yearly flush with a descaling solution to remove mineral scale from the heat exchanger — especially in hard water areas — to maintain efficiency and lifespan.
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Inspect connections: Regularly check gas and water line connections for leaks, corrosion, or loose fittings; tighten or repair as needed.
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Venting check: Ensure venting paths are clear and free of blockages or damage; proper airflow/exhaust is crucial for safe, efficient operation.
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Clean exterior: Wipe the outer casing with a soft, damp cloth periodically; avoid abrasive cleaners to protect surfaces.
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Monitor performance: Notice any unusual noises, fluctuating temperatures, or error codes and address them promptly (refer to your manual or a professional).
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Professional servicing: Schedule professional inspections annually to verify gas pressure, burner condition, and internal components for long‑term reliability.
