Bradford White Tankless Water Heater: Models, Sizing, and Real Costs

A properly sized Bradford White tankless water heater delivers endless hot water while shrinking your heating footprint to about the size of a carry-on suitcase on the wall. Bradford White is a contractor-favorite American manufacturer that sells almost exclusively through professional installers, not big-box shelves, which keeps its units out of DIY hands but generally means a plumber who knows the line will hang it. Expect the unit itself to run $1,000 to $1,800, with installed jobs landing between $3,000 and $5,500.

The Infiniti Line Explained

Bradford White’s condensing tankless family carries the Infiniti name. The current K and GR series push thermal efficiency into the 0.93 to 0.96 UEF range, meaning 93 to 96 cents of every gas dollar becomes hot water. Condensing models capture heat from the exhaust that older non-condensing units send up the flue, which is why they vent with inexpensive PVC or polypropylene instead of costly stainless steel.

Flow ratings span roughly 5.5 to 10 gallons per minute depending on model and incoming water temperature. The bigger GR units handle whole-house demand in cold climates; smaller models suit warm-climate homes or two-bath houses.

Sizing It to Your Home

Tankless sizing hinges on two numbers: how many gallons per minute you need at once, and how far you must raise the water temperature, called temperature rise. Add up simultaneous fixtures:

• Shower: 1.5 to 2.5 GPM
• Kitchen faucet: 1.5 GPM
• Bathroom faucet: 1.0 GPM
• Dishwasher: 1.5 GPM

A family running two showers at once needs roughly 4 to 5 GPM. Now the temperature rise: if your groundwater enters at 45°F in a northern winter and you want 120°F output, that is a 75°F rise, and every tankless unit produces fewer gallons per minute the harder it has to work. A unit rated 10 GPM at a 35°F rise might only deliver 6 GPM at a 75°F rise. Size for your coldest month, not the annual average, or you will run short in January.

Gas and Venting Requirements

This is where tankless retrofits get expensive. A Bradford White tankless water heater can demand 150,000 to 199,000 BTU at full fire, several times what an old tank drew. Your existing 1/2-inch gas line often cannot feed that, so budget for an upgrade to 3/4-inch supply and confirm the meter and regulator can keep up.

Condensing Infiniti models vent through two-inch or three-inch PVC and can run concentric or two-pipe. They also produce acidic condensate that must drain to a proper location, often through a neutralizer cartridge before it hits your plumbing. Skip the neutralizer and you slowly eat through cast-iron or metal drain lines.

Electric Requirements

Even gas tankless units need 120-volt power for the electronics, igniter, and fan. Plan for a nearby dedicated outlet. During a power outage, a gas tankless will not fire without that electricity, so homes on wells or in storm-prone areas sometimes pair one with a small battery backup or generator inlet.

Installation Timeline and Cost Breakdown

A straightforward tank-to-tankless swap runs a licensed plumber six to eight hours. A first-time tankless install in a home with no existing gas or venting can stretch to a full day or two. Rough cost pieces:

1. Unit: $1,000 to $1,800
2. Gas line upgrade: $300 to $800
3. Venting and condensate: $300 to $600
4. Labor: $1,000 to $2,000
5. Permit and inspection: $75 to $300

Because Bradford White sells only through the trade, you cannot buy the unit at a home center and hand it to a handyman. That channel keeps warranty support tight but means shopping installers, not boxes.

Condensing vs. Non-Condensing Explained

Bradford White builds both condensing and non-condensing tankless units, and the distinction drives both efficiency and installation cost. A non-condensing unit uses a single heat exchanger and sends hot exhaust, still carrying usable energy, up the flue. Because that exhaust runs hot, it requires expensive Category III stainless steel venting. Non-condensing units land around 0.80 to 0.82 UEF.

A condensing unit, like the Infiniti K and GR series, adds a second heat exchanger that wrings additional heat from the exhaust before it exits. The exhaust leaves so cool that it vents through inexpensive PVC or polypropylene, and efficiency climbs into the 0.93 to 0.96 range. The tradeoff is the acidic condensate that second exchanger produces, which must be neutralized and drained. For most homeowners, the condensing model’s fuel savings and cheaper venting more than justify the modest condensate handling.

Warranty and Where to Buy

Bradford White’s exclusive dealer model shapes the whole ownership experience. You cannot walk into a big-box store and buy one off the shelf; the units move only through plumbing wholesalers to licensed contractors. That channel has real benefits. It means a trained professional installs your unit, protecting the warranty, and it means genuine parts and support flow through established supply houses.

Warranty coverage on the Infiniti line typically runs up to 15 years on the heat exchanger, 5 years on parts, and 1 year on labor for residential installs, though you should confirm current terms with your installer. Register the unit promptly and keep the installation paperwork. Because a plumber must install it for the warranty to hold, factor professional installation into your plan from the start rather than hunting for a DIY shortcut that does not exist with this brand.

Operating Costs and Payback

A tankless unit’s appeal is not just endless hot water but lower operating cost over its life. A standard tank loses heat continuously through its walls, so-called standby loss, reheating water you are not using. A tankless heats only on demand, eliminating that waste. A high-efficiency condensing Bradford White tankless water heater can trim water-heating energy use by 20 to 30 percent versus an older tank, depending on your habits and gas prices.

Payback depends on your usage and local gas rates. A household that uses a lot of hot water sees faster returns; a light user sees slower payback but still gains the endless-hot-water convenience and the reclaimed floor space. Over a 20-year service life, roughly double a tank’s lifespan, the efficiency gains and the avoided second tank replacement often make the higher upfront cost worthwhile.

Maintenance to Protect Your Investment

Hard water is the enemy of any tankless heat exchanger. Scale builds inside the narrow passages and chokes flow and efficiency. Flush the unit with white vinegar or a descaling solution once a year, or twice if your water tests above 10 grains per gallon of hardness. Bradford White units include isolation valves on many installs; if yours lacks them, have the plumber add a service valve kit for about $60 so future flushes take 45 minutes instead of a plumbing disassembly.

Clean the inlet water filter screen every few months and check the venting for obstructions each fall before heating season.

Recirculation for Instant Hot Water

One common complaint about any tankless unit is the wait for hot water to travel from the heater to a distant faucet, since the unit only fires once water flows. Bradford White and other makers address this with recirculation options. A dedicated recirculation line or a crossover valve under the farthest fixture keeps a small volume of warm water primed in the pipes so hot water arrives at the tap in seconds rather than after a long, wasteful run.

Some Infiniti models support an internal recirculation pump or an external pump on a timer or on-demand button. The tradeoff is a small amount of added energy use to keep water circulating, offset by the water you stop pouring down the drain while waiting. In a large home where the master bath sits far from the utility room, recirculation transforms the daily experience and is worth discussing with your installer at the planning stage.

Common Installation Mistakes to Avoid

Because a Bradford White tankless water heater is a professional-install product, most problems trace to shortcuts during setup rather than the unit itself. The recurring culprits:

• Undersized gas line: feeding a 199,000 BTU unit through an old half-inch line starves the burner and causes flame-loss faults.
• Skipping the condensate neutralizer: the acidic condensate slowly eats metal drains.
• No isolation valves: leaving them off turns a 45-minute annual flush into a plumbing teardown.
• Ignoring water hardness: installing in hard-water areas without a softener guarantees scale problems.
• Improper venting slope: condensing vent runs must slope back to drain condensate, or water pools and faults the unit.

Choose an installer experienced with the Infiniti line, confirm these details up front, and your unit will run trouble-free for its full service life.

Is It the Right Choice?

Choose a Bradford White tankless water heater if you want endless hot water, a 15 to 20 year service life that doubles a tank’s, and lower standby losses. It shines in homes with staggered hot-water demand and reclaimed floor space. It makes less sense if your gas service is undersized and the upgrade cost balloons, or if your household draws heavy simultaneous demand in a very cold climate without room for a top-tier GR model. For most homes, though, a correctly sized Infiniti unit installed by a plumber who knows the line is a decades-long upgrade in comfort and efficiency.