Propane Gas Tankless Water Heater Up to 5.1 GPM - Compact Instant Hot

In this review of the Propane Gas Tankless Water Heater, the bottom line is practical: this unit is best for households that need compact, on-demand hot water for a couple of fixtures and want a propane option that saves space. The reviewer found the heater delivers continuous hot water without a storage tank, with clear safety features and precise temperature control that matter for everyday use. Installation is straightforward for those comfortable with basic plumbing and gas connections, and the unit's CSA certification reassures on safety.

Key Features

• Endless Hot Water: Powered by propane and 120 volts, the unit supplies continuous hot water up to 5.1 GPM so several outlets can get hot water without waiting for a tank to recover.
• High Output: With 120,000 BTU capacity, the heater can maintain flow at higher demand points compared with small portable models.
• Safety Certified: CSA certification and built-in protections like overheating and flameout safeguards help protect the household and meet national safety standards.
• Precise Temperature Control: The internal sensor adjusts quickly to keep temperature variation within about 1F so users see steady output at the tap.
• Durable Materials: The oxygen-free copper water tank offers improved thermal conductivity and corrosion resistance for a longer service life.
• Space Saving Design: At 22.8 in high by 14.6 in wide and 7.0 in deep, the unit occupies substantially less room than a traditional tank heater and uses a universal 3/4" NPT interface for plumbing connections.

Who It's For

This heater is a strong option for owners of small to medium homes, cabins, or pools who want an efficient propane-fired tankless solution that fits in tight mechanical spaces. It works well for a 1-2 bathroom setup or for dedicated outdoor/pool heating where continuous hot water is desired without a large installation footprint.

It is not the best choice for very large households with simultaneous high hot water demand across many bathrooms, or for buyers who need a packaged installation kit including venting accessories, since the item does not include an exhaust pipe and some customers reported sensitivity to installation quality.

Pros & Cons

Pros

• Reliable continuous hot water output suitable for multiple fixtures within moderate demand.
• CSA certified with overheating and accidental flameout protection for safer indoor installation.
• Compact footprint saves more than 50% of space compared with tank heaters and uses durable oxygen-free copper internals.
• Precise temperature control keeps fluctuations to about 1F for steady comfort.

Cons

• Temperature results vary by installation and water distance; some users reported only marginal heat in certain setups.
• The unit ships without an exhaust pipe and may show residual moisture from factory testing, requiring attention during install.

Specifications

Brand	MIZUDO
Model Type	Propane Tankless Water Heater, Gen 2
Maximum Flow	Up to 5.1 GPM
Heating Capacity	120,000 BTU
Power	Propane fuel and 120 volts
Dimensions	H 22.8 in x W 14.6 in x D 7.0 in
Connections	Universal 3/4' NPT

Our Verdict

The MIZUDO Propane Tankless Water Heater is a practical, space-saving choice for small homes, cabins, or pool areas that need continuous hot water without a storage tank. Its CSA certification, durable copper internals, and tight temperature control make it good value for buyers comfortable with a separate exhaust and proper installation; expect the best performance when sized and installed correctly.

Frequently Asked Questions

Why is the packaging inside wet?
The unit is briefly tested with water and power at the factory, so residual moisture on the unit or in the package is normal and does not affect operation.

Why is there no hot water immediately?
Hot water arrival depends on the distance between the heater and the outlet point; there is a short wait while hot water travels through the plumbing.

Does the unit include an exhaust pipe?
No, the item does not come with an exhaust pipe and buyers should plan for appropriate venting during installation.