Your water heater tank takes up a third of the garage, your gas bill keeps climbing, and the last time it leaked, you found out the hard way that it had been there since the house was built? That’s usually the moment people call us. Tankless water heater installation in San Jose is what our team handles most days of the week, whether it’s a 1960s bungalow off The Alameda or a new build in Evergreen with an ADU on the back lot. Grab a quote below, or just call — we’ll talk size, price, and timing right on the phone.
We’ve been at this for almost a decade, all across the South Bay. Our techs carry full insurance and pass a background check before we ever hand them a truck key.
Tankless Installation Options for San Jose Properties
Every house is a little different, and we size the job to yours instead of handing you whatever’s on the truck.
Tank-to-Tankless Water Heater Conversion
This is the job we run most. An old 40 or 50-gallon tank comes out. The gas line gets rerouted. Venting gets upgraded if it needs it. A lot of the time, we’ll add a recirculation loop so you’re not waiting thirty seconds for hot water in the far bathroom. One day, usually, but sometimes even less.
New Tankless Water Heater Installation
Building an ADU, redoing a kitchen, or finishing out a garage? We can easily plan the gas line, venting, and water hookups around the actual space instead of squeezing the unit into whatever corner is left.
Replacing an Aging Tankless Unit
A tankless system can run 15 to 20 years, but the heat exchanger and venting components give out sooner than that. Error codes, dropping pressure, hot water that comes and goes… At some point a full tankless water heater replacement costs less than another round of repairs.
Commercial and Multi-Unit Tankless Systems
Downtown apartment buildings, small offices, multi-family properties — a lot of these run on cascading tankless setups, several units chained together so nobody’s mechanical room turns into a warehouse of tanks. We size and stage it so every tenant gets hot water, even during the 7 a.m. rush.
Schedule a Free Estimate of Your Water Heater Project
Fuel type matters here almost as much as sizing does.
Condensing Gas Tankless Water Heaters
These pull extra heat out of the exhaust before it escapes, which gets efficiency above 90%. They cost more to install, but if your household is running two showers and a dishwasher at the same time, the fuel savings show up on the bill pretty quick. Most of our gas tankless water heater installation jobs these days end up as condensing units.
Non-Condensing Gas Tankless Water Heaters
Cheaper to put in, a fine fit for smaller households or a secondary unit somewhere. It is less efficient, and the venting rules are stricter, but not everybody needs top-tier efficiency. A good number of tankless water heaters in San Jose garages are still non-condensing models, and they've held up fine for years with basic maintenance.
Electric Tankless Water Heaters
No gas line, no venting, nothing burning. Electric tankless water heater installation makes sense for smaller uses. But for whole-house electric, we're going to check your panel's amperage before quoting anything, because a lot of older San Jose homes just don't have the capacity yet.
The Steps Behind a Complete Tankless Installation
Home Visit and Sizing
We look at fixture count, peak usage, your gas line or panel capacity, and how venting will run before recommending a unit. Guess on the size and you end up with a lukewarm shower at 7 p.m. when everyone’s home.
Removing the Old Unit
Converting from a tank, we drain it and haul it off. Nothing is left behind, no rusted tank sitting in the corner of the garage for months.
Gas, Water, and Venting Work
Here’s where the license actually matters. Gas lines get run or modified, water lines connected, venting installed to code — not to whatever’s quickest.
Mounting and Connecting the Unit
The unit goes up on the wall, gets wired or piped in, and ties into your existing plumbing.
Testing and Walkthrough
We run it, check every connection for leaks, test the temperature at a few fixtures around the house, and go over the settings with you before we pack up.
San Jose Permits for Tankless Water Heater Installation
Most tankless water heater installation in San Jose jobs need a city permit, especially if gas lines change or venting gets modified. Skip it, and it tends to come back later — usually during a home sale inspection, when it becomes somebody’s problem to fix retroactively. We pull the permit ourselves, get the inspection scheduled, and deal with the city paperwork so that’s one less thing on your plate.
Why San Jose Property Owners Call Fuse Service
Local Knowledge That Actually Helps
We’ve worked enough San Jose neighborhoods to know which ones still have older gas lines that need an upgrade before a tankless unit goes in.
Licensed, Insured, and Trained
Every tankless water heater installer on our team goes through manufacturer training. And it isn’t just paperwork — get the install wrong and the manufacturer won’t honor the warranty, full stop.
Posted on Yelp
Elise B.
Wilson did a great job installing a new thermostat. He offered different options of thermostats to choose from, and also fixed some wiring issues. He was timely, friendly and efficient.
Posted on Yelp
Rashmi K.
We reached out to Fuse Service to inquire about our options on new HVAC system. We got valuable professional advice from Cuinn. He answered all our questions and explained to us the options in detail.
Posted on Yelp
Daniel C.
We had a four zone mini split installed by Fuse and the technician, Eugene, along with his team was incredible! The installation process was super smooth, Eugene was very knowledgeable and explained the details and where the lines would be run. When the outdoor unit location was more difficult to install than expected, Eugene was happy to move the location and try to make it work. Everything was super smooth, Eugene was very punctual and detailed, the installation itself was very clean and precise, and his team left the place spotless and patched up areas so nicely. I am very impressed with his skills and attention to detail and would definitely use Fuse again for service in the future!
Posted on Yelp
Lily W.
We had Dem and Oliver install two Daikin units over the Labor Day weekend and we couldn't be happier with their professional service. They were prompt, respectful and clean. Also, Fuse came in with the lowest quote among all top rated vendors which is why we picked them in the first place. I would highly recommend Fuse for installing cooling or heating units.
Posted on Yelp
reza barazideh
I had a great experience with Fuse during the installation of our new heating and cooling system. From start to finish, the entire process was handled professionally and with great attention to detail. I especially want to recognize Adrien and Igor for their excellent work. They were extremely knowledgeable, professional, and skilled. The installation was done carefully and efficiently, and they made sure everything was properly installed, tested, and working as it should. They were also respectful of our home and took the time to answer our questions and explain everything clearly. I'm very happy with the installation and would highly recommend Fuse, to anyone looking for a professional and reliable HVAC team. Excellent work!
Posted on Yelp
Eric A.
Quick easy and painless. Not the cheapest, but they do quality work. I had my bathroom drain cleaned out and pipes snaked.
Posted on Yelp
Stephanie W.
We're just about to have our heat pump and new water heater installed, so I can't speak to that experience yet, but I had to say how helpful their sales rep, Jeff, was with all of my questions to get settled into a plan. I'm one of those people who like to know what's going on line by line, and his patience and knowledge was very appreciated!
Posted on Yelp
Nicasio C.
Received professional service from Fuse from the start of the project to the finish. Project completed was AC and furnace replacement to heat pump and air handler.
Posted on Yelp
Nate M.
Great price to value/service ratio. No complaints and would use their service again.
Current Tankless Water Heater Offers
Ask your technician which offers apply when you book — they change month to month.
Schedule Tankless Water Heater Installation in San Jose
Tired of babysitting a tank that’s on borrowed time? Fuse Service covers the whole job — sizing, permits, installation, testing — for tankless water heater installation in San Jose homeowners actually trust. Most projects get quoted same-day and finished within 24 to 48 hours.
Difficult to assess the cost without knowing the details. We should consider the unit itself and how much gas or electrical work is planned to be involved.
For most people, yes. They last longer than tank units, take up a fraction of the space, and skip the standby energy loss you get from keeping 40 gallons hot around the clock. Households with heavier hot water use see the payback fastest.
It comes down to peak flow rate — how many fixtures might be running hot water at once — plus your groundwater temperature, which varies by area. We calculate this on-site instead of pulling a number off a generic chart.
In most cases, yes, especially when gas lines change or new venting goes in. We handle the application and get the inspection on the calendar as part of the job.
Usually one day, somewhere around 4 to 8 hours, depending on how much venting and gas line work is involved.
Gas units generally handle higher flow rates, which suits bigger households. Electric needs enough panel capacity, and that sometimes means an upgrade first. We look at your setup before recommending either one.
Often, yes — federal tax credits and sometimes PG&E or local rebates for qualifying high-efficiency units. What’s available shifts throughout the year, so ask your tech what applies right now.
Don't Take Our Word for It — Check Out Our Reviews!
Posted on Yelp
Elise B.
Wilson did a great job installing a new thermostat. He offered different options of thermostats to choose from, and also fixed some wiring issues. He was timely, friendly and efficient.
Posted on Yelp
Rashmi K.
We reached out to Fuse Service to inquire about our options on new HVAC system. We got valuable professional advice from Cuinn. He answered all our questions and explained to us the options in detail.
Posted on Yelp
Daniel C.
We had a four zone mini split installed by Fuse and the technician, Eugene, along with his team was incredible! The installation process was super smooth, Eugene was very knowledgeable and explained the details and where the lines would be run. When the outdoor unit location was more difficult to install than expected, Eugene was happy to move the location and try to make it work. Everything was super smooth, Eugene was very punctual and detailed, the installation itself was very clean and precise, and his team left the place spotless and patched up areas so nicely. I am very impressed with his skills and attention to detail and would definitely use Fuse again for service in the future!
Posted on Yelp
Lily W.
We had Dem and Oliver install two Daikin units over the Labor Day weekend and we couldn't be happier with their professional service. They were prompt, respectful and clean. Also, Fuse came in with the lowest quote among all top rated vendors which is why we picked them in the first place. I would highly recommend Fuse for installing cooling or heating units.
Posted on Yelp
reza barazideh
I had a great experience with Fuse during the installation of our new heating and cooling system. From start to finish, the entire process was handled professionally and with great attention to detail. I especially want to recognize Adrien and Igor for their excellent work. They were extremely knowledgeable, professional, and skilled. The installation was done carefully and efficiently, and they made sure everything was properly installed, tested, and working as it should. They were also respectful of our home and took the time to answer our questions and explain everything clearly. I'm very happy with the installation and would highly recommend Fuse, to anyone looking for a professional and reliable HVAC team. Excellent work!
Posted on Yelp
Eric A.
Quick easy and painless. Not the cheapest, but they do quality work. I had my bathroom drain cleaned out and pipes snaked.
Posted on Yelp
Stephanie W.
We're just about to have our heat pump and new water heater installed, so I can't speak to that experience yet, but I had to say how helpful their sales rep, Jeff, was with all of my questions to get settled into a plan. I'm one of those people who like to know what's going on line by line, and his patience and knowledge was very appreciated!
Posted on Yelp
Nicasio C.
Received professional service from Fuse from the start of the project to the finish. Project completed was AC and furnace replacement to heat pump and air handler.
Posted on Yelp
Nate M.
Great price to value/service ratio. No complaints and would use their service again.
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