Mizudo CF170 Tankless Water Heater Natural Gas 7.5 GPM 170,000 BTU New - FDG-CF170AW-NG
The CF170 is a powerful and efficient tankless water heater that can satisfy the hot water needs of your entire family. With a high 170,000 BTU heating capacity, it can provide up to 8.1 GPM of hot water, making it suitable for 3-4 outlet points. Featuring a compact design for easy installation, this natural gas indoor unit boasts a high energy conversion rate, effectively reducing energy loss. The built-in forced exhaust fan ensures stable combustion and eliminates the influence of external wind.
What our Experts Think
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Powerful on‑demand hot water performance
The Mizudo CF170 Tankless Water Heater Natural Gas 7.5 GPM 170,000 BTU New – FDG‑CF170AW‑NG delivers continuous hot water without a storage tank, supporting multiple fixtures simultaneously — ideal for families with showers, sinks, and appliances running at once. Its 170,000 BTU output and up to ~7.5 GPM flow balance strong heating capacity with efficient performance.
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Compact indoor installation
Designed for indoor wall‑mounted use, this unit saves space compared with bulky tank heaters, making it a great fit for utility rooms and compact installations.
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Efficient & certified operation
With a UEF over 0.81 and CSA certification, it offers better energy conversion and stable hot water supply than many traditional tank models.
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Precise temperature control
Built‑in controls maintain water temperatures consistently in the 95–149 °F range, helping prevent fluctuations during varied demand.
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Durable design for long‑term use
Features like oxygen‑free copper heat transfer components, anti‑scale protection, and robust combustion staging enhance reliability and reduce corrosion risk over time.
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Professional installation recommended
Standard ¾″ NPT water and gas connections and power vent requirements make installation easier for qualified technicians — ensuring performance, safety, and compliance.
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Best for medium‑to‑larger homes
Experts recommend this model for households with higher hot water demand — particularly where space is limited and on‑demand, energy‑efficient performance is a priority
Q&A
Q: What is the Mizudo CF170 Natural Gas Tankless Water Heater (FDG‑CF170AW‑NG)?
A: A natural gas tankless water heater with powerful 170,000 BTU heating capacity and up to 7.5 GPM continuous hot water flow for residential indoor applications.
Q: How much hot water can it deliver?
A: It delivers up to 7.5 gallons per minute (GPM)—enough to supply multiple fixtures like showers and faucets simultaneously depending on inlet water temperature.
Q: What installation type does it support?
A: Designed primarily for indoor wall‑mounted installation with standard 3/4″ NPT gas and water connections.
Q: Is it energy‑efficient?
A: Yes—features a Uniform Energy Factor (UEF) over 0.81, meaning efficient gas usage and lower energy waste compared with conventional tank heaters.
Q: What temperature control features does it have?
A: Electronic temperature control lets you adjust from about 95 °F to 149 °F for precise hot water comfort.
Q: Is it certified and safe?
A: CSA certified, with multi‑safety protections including overheat and dry combustion protection.
Q: What are its key benefits?
A: Gives endless hot water on demand, saves space compared with tank systems, and can support several hot water points at once.
Q: Does it require professional installation?
A: Yes — licensed plumbing and gas line setup is recommended to ensure safe and code‑compliant installation.
Maintenance Tips
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Annual Flush & Descale: Flush the heat exchanger yearly with a descaling solution to remove mineral buildup and maintain flow efficiency — crucial in hard‑water areas.
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Clean Inlet Filter: Periodically remove and rinse the water inlet filter to clear debris and protect internal components.
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Inspect Gas & Water Connections: Check gas and water lines for leaks, corrosion, or loose fittings; tighten and service as needed for safe operation.
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Clear Venting & Air Intake: Ensure vent pipes and air intake paths are free of obstructions to support proper combustion and exhaust.
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Check Exterior & Controls: Wipe down the exterior and check LED/readout panel for error codes or irregularities; address issues promptly.
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Professional Annual Service: Have a licensed technician inspect and service the unit once yearly to preserve efficiency and safety.
