NTI Boiler Installation & Service — San Francisco

Hydroflow is a trained NTI contractor serving San Francisco. North American-made, Energy Star certified high-efficiency boilers and combi-furnaces.

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Trained NTI Contractor

North American-Made Boilers with Contractor-Level Support

Hydroflow is a trained NTI contractor. We are experienced in installing and servicing NTI’s full line of high-efficiency gas boilers and combi-furnaces across San Francisco. Our technicians understand the nuances of these systems. We appreciate NTI’s commitment to quality and their contractor support model. Their boilers are a strong option for homeowners looking for a reliable, high-efficiency heating solution backed by excellent local contractor support — a rarity in the high-efficiency boiler market.

NTI Products We Install:

Tft Series — high-efficiency fire tube boilers with a user-friendly interface
Tx Series — compact affordable condensing boilers for residential use
Vmax Series — premium condensing with built-in primary/secondary piping

Why Choose NTI

Family-Operated, North American Manufacturing, Energy Star Rated

NTI is a family-operated business based in North America, known for manufacturing high-quality, innovative heating products. Unlike many competitors that offshore manufacturing, NTI maintains strict quality control through North American production. All NTI boilers are Energy Star certified, helping reduce your heating costs. Their Vmax series includes built-in primary/secondary piping — a feature that simplifies hydronic system design and reduces install complexity for radiant heating applications.

NTI Advantages:

North American Manufacturing — family-operated with rigorous quality control
Energy Star Certified — all models meet federal high-efficiency standards
Innovative Design — Vmax series built-in primary/secondary piping simplifies radiant systems
Proven Reliability — top-tier components with rigorous factory testing
Excellent Contractor Support — direct access to NTI technical support

NTI Services We Offer

Boiler Installation

Full NTI boiler installation including system design, PVC venting, gas line sizing, and SFDBI permitting. The Vmax’s built-in piping reduces install time and complexity for radiant systems.

Combi-Furnace Install

NTI combi-furnaces provide both space heating and domestic hot water from a single compact unit — a great alternative for homes that need both without the space for separate appliances.

Maintenance & Repair

Annual NTI maintenance including combustion chamber cleaning, spark gap check, low water cutoff testing, and system fluid pH verification for stainless steel heat exchangers.

NTI FAQ

What does NTI Error Code ‘Loc’ mean?

‘Loc’ stands for Lockout, followed by a number (e.g., Loc 1). The boiler has shut down for safety. Loc 1 is usually an ignition failure. You can try one reset, but if it returns, a technician needs to check the gas supply and ignition system — repeated resets can mask a dangerous underlying issue.

What is NTI Error Code ‘Err’?

‘Err’ indicates a blocking error, often sensor-related. For example, Err 6 might indicate a supply sensor problem. Unlike a Lockout, the boiler may restart automatically once the condition clears. If it keeps returning, the sensor likely needs replacement.

Why is my NTI boiler making a gurgling sound?

Gurgling almost always means air trapped in the system or heat exchanger. It can lead to overheating and Lockout errors. The system needs to be properly bled or purged of air. We include system purging in our annual maintenance visits.

How do I check the pressure on my NTI boiler?

Look for the pressure gauge on the piping near the boiler or on the display. It should read between 12 and 20 PSI when cold. Below 10 PSI means the system needs water added. Above 25 PSI suggests a failed expansion tank — a technician should inspect it promptly.

Schedule Your NTI Boiler Service Today

Trained NTI installation, maintenance, and repair across San Francisco and Marin County.

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