Tankless Water Heater Installation in Friendswood, TX
Endless hot water. 20–35% lower gas bills. Recovered closet space. Certified Rinnai, Navien, Rheem, and Noritz installers.
Tankless water heaters are ideal for many Friendswood homes: they deliver endless hot water, cut gas bills by 20–35%, last 15–20 years (nearly twice as long as a tank in our hard-water region), and free up the utility closet or attic they used to occupy. But tankless is not a one-size solution — a poorly-sized unit gives cold-sandwich showers, and a gas-line that's too small starves the burner. We do the math correctly, install to spec, and back it with a 10-year workmanship warranty.
We are certified installers for Rinnai, Navien, Rheem, and Noritz — the four brands with proven service networks in the Houston area. Our installations always include proper Category-III venting, gas-line upsizing where required, an isolation valve service kit for annual flushing, and a City of Friendswood permit and inspection.
When tankless makes sense for a Friendswood home
- You run out of hot water when 2+ showers overlap
- Family of 3+ with a soaking tub or teenagers
- Current tank is 8+ years old and losing capacity
- You want to reclaim closet or attic space
- Your gas bill has climbed steadily for the past 3 years
- You want to reduce standby heat loss and lower utility costs
- You're remodeling a bathroom and considering a whole-house upgrade
- You want a longer-life unit — 15–20 years vs. tank's 8–12 in Friendswood water
Our Process
The same steps on every job — from a $189 drain clear to a $9,000 whole-house repipe.
- 1
Sizing & Fuel Check
GPM demand analysis based on your fixtures, plus gas-line sizing (may require upsize from 1/2" to 3/4" — we'll tell you).
- 2
Written Options
Rinnai vs. Navien vs. Rheem vs. Noritz — the pros and cons for your specific home, in writing.
- 3
Permit & Prep
City of Friendswood permit pulled. If gas-line upsize or venting run is needed, that's spec'd and priced upfront.
- 4
Install
Full tie-in with isolation service valves, Cat III direct-vent, condensate line, 120V outlet for controller, and manufacturer-required clearances.
- 5
Startup & Inspection
Manufacturer startup, full BTU verification, temperature test at farthest fixture, city inspection, and warranty registration.
Your Tankless Appointment, Step by Step
Before we arrive
A licensed dispatcher confirms your address, describes what our tech will do first, and gives you a firm arrival window. For emergencies inside 77546 we hold a 45-minute promise; scheduled tankless visits get a 2-hour window.
On the truck
Your assigned Master Plumber arrives in a branded vehicle stocked with common tankless parts — Delta, Moen, Kohler, Rheem, Bradford White, Uponor PEX-A — so most jobs finish in one visit without a supply-house trip.
Before work starts
You get a written flat-rate price in your hand covering labor, materials, permits (when required by the City of Friendswood), warranty terms, and cleanup responsibility. You approve in writing before we lift a wrench.
What We Service
What Affects Your Price
We don't publish fake prices to trick you into calling. We do publish the honest factors that drive real cost — so when we hand you a written quote, you know why.
Unit + capacity
A 199,000 BTU condensing unit ($1,900 street) is different from an 180,000 BTU non-condensing ($1,050 street).
Gas line upsize
Most tankless conversions in Friendswood require upsizing the gas line from 1/2" to 3/4" or 1" — factor $400–$900 depending on run.
Venting
Category-III stainless venting for non-condensing units, PVC for condensing. Run length and roof/side-wall termination affect cost.
Location
Attic swap-in replacing an existing tank is fastest. Relocating to a garage or exterior wall adds $500–$1,200.
Why This Matters in Friendswood, TX
The Gulf Coast climate is actually kind to tankless units — mild winters mean no serious cold-inlet penalty on unit BTU capacity, and outdoor-mounted tankless (Rinnai's exterior series in particular) is a completely valid option that saves interior square footage. On the flip side, our aggressive hard water means annual descaling with a vinegar or CLR flush is essential — without it, a $2,400 tankless can be scale-choked and warranty-voided within 4 years. We include an isolation service kit on every install so descaling is a simple annual maintenance visit.
Why Friendswood Homeowners Trust Us for Tankless
Friendswood Plumbing Co. has been serving Friendswood and Greater Houston for 22 years — 487+ verified reviews at a 4.9-star average, Texas Master Plumber License #M-40217, and a 45-minute response inside Friendswood 77546/77549. Every tankless job we do carries a written 2-year workmanship warranty and a firm flat-rate price handed to you before we start.
Master Plumber on every tankless job
Tankless Water Heater Installation is diagnosed and performed by a licensed Texas Master Plumber — never a sub, never a trainee working unsupervised.
Flat-rate written price before we start
You see the full tankless price in writing — labor, parts, permits, cleanup — before any work begins. No hourly meter running, no surprise upcharges.
Trucks stocked for tankless
Rinnai tankless installation (RSC and Super High Efficiency), Navien tankless installation (NPE-A2 series), and the common failure points — stocked on our trucks so most tankless jobs finish in one visit.
2-year workmanship warranty
Every tankless repair carries a 2-year written workmanship warranty, honored by the same crew. Manufacturer warranties pass through on parts.
Related Services
Water Heater Repair & Installation
Tank, tankless, gas, or electric — our licensed team stocks Rheem, Bradford White, A.
Water Filtration & Softeners
Friendswood water runs 12–15 grains hard.
General Plumbing Repair
From a dripping faucet to a slow shower drain, our Texas Master Plumbers arrive on time with the parts to solve it today.
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Tankless Across Friendswood & Greater Houston
Our tankless crews dispatch daily from our Hunters Lane hub in Friendswood — 45-minute response inside Friendswood 77546/77549. We serve the entire Tier 1 corridor along FM 518 and FM 528: Friendswood 77546 and 77549, Pearland, Alvin, Manvel, Webster, and Brookside Village. Extended service reaches Galveston County, south Harris County, north Brazoria County, and Fort Bend County — 39+ cities in total. Every job runs by the same Texas Master Plumber, at the same flat-rate pricing, with the same 2-year written warranty.
Ready for Tankless in Friendswood?
Every tankless job we do is priced flat-rate in writing before we start, performed by a Texas Master Plumber (never a sub), and backed by a written 2-year workmanship warranty. If you have an active emergency, skip the form and call — a licensed dispatcher answers on the first ring, 24/7.
Frequently Asked
How much does a tankless installation cost in Friendswood?
A straightforward tank-to-tankless conversion runs $3,900–$6,200 depending on unit choice, gas-line upsize, and venting. We provide firm written quotes.
Will a tankless unit save me money on gas?
For most Friendswood homes, yes — 20–35% reduction in water heating gas usage because there's no standby loss. Actual savings depend on hot water usage patterns.
Can I get instant hot water at the farthest fixture?
Yes, with a recirculation loop. Some tankless units (Navien with built-in recirc) do it internally; others add a small pump under the far sink.
How long does a tankless last in Friendswood?
15–20 years is typical, provided the unit is descaled annually. Without descaling in our hard-water region, expect 6–9 years and voided warranty.
Do I need to service my tankless every year?
Yes — an annual descaling flush is non-negotiable in Friendswood water. We offer a $189/year maintenance plan that includes the descale and a full operational check.
45-minute response inside Friendswood 77546/77549
Ready for Endless Hot Water?
Certified Rinnai, Navien, Rheem, Noritz installer. Free written quote. Call (831) 290-4327.