Your tank heater is leaking at the base, the hot water runs out halfway through the second shower, or you're simply tired of dedicating a closet to a 50-gallon drum. Alliance installs tankless water heaters in Glendale homes — sizing the unit to your actual fixture count, upsizing the gas line when the load calls for it, and venting it to code. We're family owned and operated since 2010, licensed under CSLB 1119845, with over 40 years of combined trade experience. You approve a flat price before we start. No mystery invoices.
What tankless water heater installation involves
A tankless unit heats water on demand, so the install is a different animal than swapping one tank for another. It starts with load math: how many bathrooms, how many simultaneous fixtures, and how cold the incoming water runs. That gives us the gallons-per-minute rating and the BTU input the unit needs.
From there, three things usually have to change. Gas: most tankless heaters need 150,000–199,000 BTU, which often means a larger gas line run back to the meter. Venting: tankless units use sealed stainless or PVC venting terminated through a sidewall or roof, not the old B-vent your tank shared with the furnace. Water: we add isolation valves with service ports so the unit can be descaled without cutting pipe.
A typical Glendale job means removing and hauling off the old tank, mounting the new unit on the wall, running gas, water and condensate as needed, tying in power for the control board, and pressure-testing every joint. We fire it up, verify gas pressure under full load, check the temperature rise at the farthest fixture, and walk you through the controller before we pack up.
Why Alliance for tankless water heater installation
- Flat price approved before we start. You see the number, you approve it, and that's the number on the invoice. Free estimates on new installations.
- Same-day service and a 24/7 emergency line. If your tank failed this morning, you don't have to wait a week for hot water.
- Sized and gas-verified, not guessed. We measure gas line capacity and fixture demand first, so the unit you get actually delivers hot water to two showers at once.
- One licensed team for plumbing, heating, air and electrical. CSLB 1119845 — the gas, the venting and the 120V circuit are handled by the same crew, not three subcontractors.
- Service valves on every install. We build in isolation valves so future descaling is a 45-minute job instead of a plumbing project.
- $150 tankless flush and service when your unit is due for maintenance, plus Senior, Dan's and Veteran discounts year round.
Our tankless water heater installation process
- Call and schedule. Tell us your home's bathroom count, your current heater's size, and where it sits. We book you — often same day.
- On-site evaluation. We check gas meter capacity and line size, look at venting routes, review the electrical supply, and measure incoming water temperature.
- Flat-price proposal. You get the unit recommendation, the scope, and one number covering labor, materials, permitting and haul-away. You approve before any work begins.
- Old unit removed. We drain, disconnect and haul off the existing tank, and cap or re-route the abandoned vent.
- Install and connect. Wall mounting, gas line sizing and run, water connections with isolation valves, condensate management, sealed venting, and electrical tie-in.
- Test and commission. Gas pressure under full fire, leak test on every joint, temperature rise verified at the fixtures, error-code check on the control board.
- Walkthrough. We set your temperature, show you the controller and the descaling ports, and explain the maintenance interval before we leave.
What tankless water heater installation typically costs
Estimates range based on the unit's capacity, whether your gas line needs upsizing, how far the new venting has to travel, and whether you're converting from a tank or replacing an existing tankless. A straight tankless-to-tankless swap in the same location is the least expensive scenario. A garage tank converted to a wall-mounted condensing unit with a new 3/4" gas run back to the meter and a sidewall vent sits at the higher end.
Our flat price includes the unit, labor, gas and water connections, venting materials, isolation valves, permitting, and removal of the old heater. Things that can add cost: a gas meter upgrade required by the utility, drywall or stucco repair at the vent penetration, or relocating the heater to a new wall. Whole-home water treatment for Glendale's hard water is quoted separately.
Estimates on new installations are free. Call us and we'll give you the real number before anything gets touched.
Service areas we cover
Alliance is based in Fontana and works throughout Los Angeles and Orange County, including:
- Glendale
- Burbank
- Pasadena
- La Cañada Flintridge
- Eagle Rock
- Los Angeles
- Montrose
- South Pasadena
- Fontana
- Orange County
FAQ
How long does a tankless water heater installation take in Glendale?
A tankless-to-tankless replacement usually runs 4–6 hours. A conversion from a tank — with new gas sizing and new venting — is typically a full day. We tell you which one you're looking at during the estimate.
Will my existing gas line work?
Sometimes. A 1/2" line feeding an old 40-gallon tank generally won't carry 199,000 BTU. We calculate the load and measure the run before quoting, so there are no surprise change orders once the wall is open.
Do I need a permit?
Yes. Gas, venting and water heater replacement are permitted work in Glendale. Permitting is handled as part of the flat price.
Does Glendale's hard water hurt a tankless heater?
Scale is the main enemy of a tankless unit's heat exchanger. That's why we install isolation valves on every job and recommend an annual descale — we offer a $150 tankless flush and service. Water treatment is another option worth discussing. If you've noticed pressure dropping off at your fixtures, scale buildup is often part of the story.
Can a tankless unit really run two showers at once?
Yes, if it's sized for it. That's a flow-rate and temperature-rise calculation, not a marketing claim. We size for the simultaneous demand you actually have.
What if my old heater fails on a weekend?
Our emergency line is answered 24/7. Office hours are Monday–Friday 8am–4pm and Saturday 8am–2pm, but a failed or leaking water heater doesn't have to wait for Monday. Before you leave town, it's also worth shutting down your plumbing properly for a vacation.
Ready for endless hot water and a wall back in your garage? Call Alliance at +19516220842 for a free estimate on tankless water heater installation in Glendale. We'll size it right, price it flat, and solve it the first time.