HUG Hydronics Products and Accessories

• Limited warranty for 12 years on all HUG-branded parts and accessories (water heaters, boilers, and PEX pipes are covered under their manufacturer's warranty). The HUG-branded items are repaired or replaced at no cost for the first 3 years from the ship date. All warranty claims include free shipping. After the first 3 years, customers will pay an increasing portion for all HUG Hydronics-branded replacement items. See the chart below.
• This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Natural disasters, acts of God, or other forms of abuse, misuse or improper disassembly of the HUG Hydronics System and accessories are not covered by this warranty. 
• Depending on the condition of your HUG Hydronics system, we can help you choose the best repair or replacement items. In no event shall HUG Hydronics be liable for any incidental, consequential, special, or punitive damages resulting from the failure of any product.
• The Serial Number is engraved on the front to the right of the Control Board enclosure, as shown in Figure 1. If you do not see it there, look behind the Control Board to the right side panel of your tank, as shown in Figure 2. 
• 
  *Please note: The CONTROL BOARD serial number starts with “00” and the TANK serial number starts with a “02” 

If you purchased HUG-branded products from HUG Hydronics, the warranty is automatically registered. All other products need to be registered with their manufacturer.

If you purchased the system retail go online to: 

https://hughydronics.com/pages/warranty-registration-1

State Tankless Heaters Gas/Electric

Manufacturer Warranty Notice

Please be advised that while State Water Heaters previously allowed their tankless water heaters for space heating, they changed this policy July 2025. State now explicitly dictates that their tankless water heaters—both gas and electric models—are not warranted by the manufacturer for space heating applications. State's warranty policies now exclude water heaters used for space heating, stating that they are approved for instantaneous domestic water heating only.

HUG Hydronics 3-Year Limited Coverage

Because the manufacturer warranty no longer covers space heating, HUG Hydronics is independently honoring a 3-year limited warranty on these State gas and electric tankless heaters. This coverage mirrors the 3-year term provided for HUG-branded parts and accessories.

• Term: This warranty begins on the date of shipment, or on the date of product registration (registration must be completed within a 60 day period after receipt).
• Expiration: After this 3-year period, the heater is entirely out of warranty.
• Non-Transferability: This warranty and any associated credits are non-transferable and apply only to the original purchaser. If a contractor or home builder constructed the structure, the original purchaser of that building is the beneficiary of this warranty.

Important Exclusions

To ensure safe operation and protect your equipment, the following exclusions from the manufacturer apply and will void this limited warranty:

• Water Quality and Glycol (Gas Models): State gas tankless units must only be used with distilled water. The water pH must remain between 6.5 and 8.5. Introducing glycol antifreeze into the system will completely void the warranty for units installed after mid-year 2025. Customers who installed their systems prior to July 2025 and used glycol are exempt from this exclusion.
• Hard Water and Scaling: Damage to the heat exchanger caused by hard water scale is not covered.
• Freeze Damage (Gas Models): Damage caused by freezing is not covered. The internal freeze protection system relies strictly on continuous electrical power to operate; therefore, damage resulting from freezing due to power loss is excluded.
• Dry Firing (Electric Models): The warranty excludes electric heaters or components (such as heating elements) that fail due to being operated on an empty chamber.
• Lack of Maintenance: Damages resulting from failing to clean the cold water inlet filter or installing the unit in an improper environment (corrosive, dusty, or chemically contaminated) are not covered.

Repair and Replacement Limitations

HUG Hydronics holds a limited, set inventory of these specific units and cannot obtain more. Warranty claims are subject to the following:

• Parts: If a heater experiences an issue that is repairable, HUG will send replacement parts to be installed by a qualified professional.
• One-Time Replacement: If the heater suffers a failure within the 3-year window, HUG will replace the unit a maximum of one time, subject to available inventory.
• Unavailable Inventory: If a replacement unit is not available in our inventory, HUG Hydronics will provide a credit toward a system upgrade.
• Labor Exclusion: This warranty covers parts or replacement units only. Any labor costs associated with troubleshooting, repair, or installation are strictly not covered.

Post-Warranty Upgrade Credit

If a replacement unit is unavailable during your warranty term, HUG Hydronics will offer you an exclusive credit toward the purchase of a new, fully compatible boiler upgrade. This credit option is no longer available after the 3-year warranty period has expired.

Mandatory Professional Installation & Registration (Gas Units)

Safety is our primary concern. If you are operating a gas unit or any future gas boiler, the installation and initial start-up procedure must be performed by a qualified, licensed professional, such as a licensed plumber, HVAC professional or gas fitter.

Registration serves as your verification to HUG Hydronics that your gas heater was installed by a certified technician. Failure to register the unit within 60 days past the ship date of your heater, or have the gas heat source professionally installed and commissioned will immediately void this limited warranty.