Gas Supply and Meter
We compare the unit's gas demand with your line size and meter, so the heater gets enough fuel when several taps run at once.
Tankless Installation
Tankless Water Heater Installation San Francisco
Running out of hot water or short on space? A wall-mounted tankless unit heats water on demand and frees up the closet.
- Gas and electric tankless units
- Gas line and venting checked first
- Old tank removed and hauled away
Tankless Water Heaters for San Francisco Homes
A tank heater keeps 40 or 50 gallons hot around the clock. A tankless unit heats water only when a tap opens, so you stop running out halfway through the second shower and get back the floor space the tank used.
The catch is what it takes to install one. Whole-house gas tankless units draw much more gas than a tank while they run, so the gas line and meter often need upsizing and the venting has to change. We check both before you commit, so the quote reflects the real job.
If your gas line or panel can't support tankless without major work, we'll say so, and a standard tank through our water heater replacement San Francisco service may be the better call.
Before We Install
What We Check First
A New Vent Route
Tankless units need their own vent, often through a side wall. We plan a route that meets clearance rules and the manufacturer's instructions.
Backflow Prevention
San Francisco's Department of Building Inspection requires a backflow prevention assembly on tankless installs, so we build it into the plan from the start.
Household Demand
We size the unit to how many showers and appliances run together, so the temperature holds when it matters.
Electric Options
Where gas isn't an option, an electric tankless unit can work for smaller loads, but it often needs a heavy electrical circuit. We check your panel first.
After the Install
Upkeep and Water Quality
The city's tap water is soft, with the SFPUC reporting average hardness around 32 ppm, so scale builds up in a tankless heat exchanger more slowly than in hard-water areas. Periodic flushing and a clean inlet screen still keep it running well, and we show you where both are before we leave.
Condensing units also need a condensate drain. We route it to an approved spot so it doesn't end up dripping into a garage or crawlspace.
Install Day
Install Day, Step by Step
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01
Site Check and Sizing
We look at your gas line, meter, vent options, water connections and how many fixtures run at once, then recommend a unit size.
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02
Gas, Vent and Water Prep
We upsize the gas line if needed, plan the vent route and add the shutoff valves and backflow assembly the install requires.
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03
Mount and Connect
We remove the old tank, mount the new unit on the wall and connect gas, water, venting and the condensate drain.
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04
Fire Up and Test
We start the unit, check for gas and water leaks, and confirm steady temperature at several fixtures running together.
Planning Your Budget
Budgeting for the Upgrade
Tankless installs usually sit at the upper end of our $2,000 to $6,500 replacement range. The cost goes up when the gas line, meter or venting needs upgrading, which is common when switching from a tank.
We confirm the price after checking your gas supply and vent route, so there are no surprises on install day.
Common Questions
Thinking About Going Tankless?
Is tankless worth it for a small household?
It depends on how you use hot water. Tankless saves space and ends running out, but the upfront cost is higher than a tank. For one or two people with modest use, a well-sized tank can be the better value, and we'll tell you which fits.
Can I still install a gas tankless water heater?
Yes. The Bay Area air district's zero-NOx standard for larger water heaters, which covers most gas tankless units, applies to units manufactured from 2031. We'll talk through gas and electric options with that in mind.
Will a tankless unit fit where my tank is now?
Usually, yes. Tankless units mount on the wall, so they often go in the same closet or garage spot. What decides the location is the vent route and clearances.
Does a tankless water heater need maintenance?
Yes, but not much. Flush the heat exchanger periodically and clean the inlet screen. On condensing models, keep the condensate drain clear.
Service Area
We work in homes throughout the city.
Ready for Endless Hot Water?
Tell us what heater you have now and where it's installed. We'll check whether tankless suits your home and give you a clear plan before any work starts.