Camplux CX264 vs ThermoMate CZ264: Honest Comparison

Last updated: May 23, 2026 · 8-minute read

Two indoor propane tankless water heaters. Same $299.99 price tag. Same target buyer — apartments, tiny houses, ADUs, and small homes looking for endless on-demand hot water without breaking the budget.

But the moment you look past the price, the two products tell very different stories.

In this honest, spec-by-spec comparison, we'll show you exactly where the Camplux CX264 outperforms the ThermoMate CZ264 — and where each model fits best. All data points come from official manufacturer pages, the DOE Energy Guide database, and CSA Group's certification records.

TL;DR — Same Price, Vastly Different Specs

The bottom line: At $299.99, the Camplux CX264 delivers measurably better performance, longer warranty coverage, and CSA-certified safety compliance — making it the stronger value choice in this price tier.

Why This Comparison Matters in 2026

The under-$300 indoor tankless water heater segment has grown rapidly over the past two years. According to a 2024 IBISWorld market analysis, tankless water heater shipments in North America grew 11.3% year-over-year in 2023, with the budget indoor segment ($200-$400) seeing the fastest growth.

This means two things for buyers:

1. There are more affordable options than ever
2. Specs vary significantly between products that look identical on price

If you're shopping the $299 indoor tankless tier, the Camplux CX264 and ThermoMate CZ264 are two of the most cross-shopped models. Let's break them down.

Round 1: Flow Rate — Can They Run Two Fixtures at Once?

Camplux CX264: 3.18 GPM

The Camplux CX264 delivers 3.18 gallons per minute of on-demand hot water. In practical terms, this means you can comfortably run:

• One standard showerhead (2.0–2.5 GPM) + one bathroom sink (0.5 GPM) simultaneously
• One shower + one kitchen sink for dishes at peak demand

ThermoMate CZ264: 3.06 GPM

The ThermoMate CZ264 delivers 3.06 GPM — about 4% less than the CX264. While this difference sounds small on paper, it matters in real-world dual-fixture scenarios. If your shower is running at 2.5 GPM and someone turns on a kitchen tap (0.6+ GPM), the CX264 has 0.08 GPM of headroom. The CZ264 will start showing pressure drops.

Winner: Camplux CX264 ✅

For 1- to 2-bathroom homes, apartments, and tiny houses where simultaneous fixture use is common, the extra 0.12 GPM of flow translates directly to a more reliable hot water experience.

Round 2: Heating Power — Will It Stay Hot in Winter?

Camplux CX264: 80,000 BTU

The CX264's 80,000 BTU/hr input means full performance even when inlet water temperatures drop. According to the U.S. Department of Energy's residential water heating standards, every 10°F drop in inlet water temperature reduces a tankless heater's effective GPM by approximately 15-20%.

Translation: When your winter groundwater hits 45°F, you need maximum BTU power to maintain full flow.

ThermoMate CZ264: 75,000 BTU

At 75,000 BTU, the CZ264 has roughly 6.25% less heating power than the CX264. In Southern U.S. climates with mild groundwater (65°F+ year-round), this gap is hardly noticeable. But in Northern climates where January groundwater dips to 40-45°F, the difference becomes meaningful — the CZ264 will drop more GPM in winter to maintain set temperature.

Winner: Camplux CX264 ✅

For anyone living in a state where winter groundwater drops below 50°F (most of the U.S.), the extra 5,000 BTU is the difference between consistent winter hot water and a colder shower in January.

Round 3: Low-Flow Startup — The Hidden Killer Spec

This is where the gap between the two models becomes dramatic.

Camplux CX264: 0.45 GPM Activation

The Camplux CX264 activates and starts heating water at just 0.45 GPM — roughly half the industry standard. This is critical for:

• Modern low-flow showerheads (1.5-1.8 GPM) when used at reduced pressure
• Water-saving bathroom faucets (often 1.0-1.2 GPM)
• Tiny homes and ADUs with smaller water supply systems
• Older homes with low water pressure (rural well systems, multi-story apartments)

ThermoMate CZ264: 0.80 GPM Minimum

The ThermoMate CZ264 requires 0.80 GPM minimum to activate. This is the standard for most budget tankless units — but it creates a real problem:

• A standard 1.5 GPM low-flow showerhead running at reduced pressure may only push 0.7 GPM through the unit → no hot water
• A bathroom faucet at trickle setting won't trigger the heater → cold water only

According to EPA WaterSense data, over 65% of new bathroom fixtures sold in 2024 were classified as low-flow (under 1.8 GPM showerheads, under 1.2 GPM faucets). If you're remodeling, you're statistically likely to install fixtures that the CZ264 may struggle with.

Winner: Camplux CX264 ✅✅ (by a wide margin)

The 0.45 GPM vs 0.80 GPM gap is the single biggest functional difference between these two products. For modern homes with water-saving fixtures, this isn't a minor preference — it's the difference between a heater that works and one that frustrates daily.

Round 4: Energy Efficiency — UEF 0.84 vs 0.81

Why UEF Matters More Than Most Buyers Realize

UEF (Uniform Energy Factor) is the DOE-mandated efficiency rating for water heaters in the U.S. Unlike "thermal efficiency" (which measures peak burning efficiency), UEF measures real-world annual efficiency including startup losses, standby losses, and modulation.

The DOE classifies tankless water heaters in tiers:

• UEF 0.78–0.81: Standard non-condensing
• UEF 0.82–0.86: High-Efficiency non-condensing
• UEF 0.87+: Premium condensing

Camplux CX264: UEF 0.84 (High-Efficiency)

At UEF 0.84, the CX264 sits comfortably in the High-Efficiency tier, crossing the critical 0.82 threshold. This qualifies it for:

• Federal 25C tax credit consideration (varies by state)
• State energy rebates in California (TECH Clean California), New York (NYSERDA), and others
• The "High-Efficiency" label in marketing and packaging

ThermoMate CZ264: UEF 0.81 (Standard)

At UEF 0.81, the CZ264 falls just below the high-efficiency threshold. This is the upper limit of the Standard tier — competent, but not eligible for the same rebate categories.

The Real Dollar Difference

For a typical 2-person household using ~64 gallons of hot water daily (DOE average):

Estimates based on national average residential propane rate of $2.66/gal and DOE Energy Guide methodology.

Net savings of the CX264 vs CZ264: ~$46/year, ~$230 over 5 years, ~$460 over 10 years.

Winner: Camplux CX264 ✅

Not just because it's more efficient — but because UEF 0.84 unlocks rebate eligibility in multiple states that UEF 0.81 misses.

Round 5: Warranty — Where the Gap Is Biggest

Here's where things get serious for long-term value.

Camplux CX264 Warranty Structure

• 6-year limited warranty on heat exchanger (the most expensive component to replace)
• 2-year limited warranty on all parts
• 24/7 U.S.-based customer support by phone, email, and message

ThermoMate CZ264 Warranty Structure

Per ThermoMate's official listing:

• 1-year limited warranty (single-tier structure)

The Cost of a 5-Year Failure

According to data from HomeAdvisor and Angi (2024 contractor surveys), the average out-of-warranty heat exchanger replacement on a tankless water heater runs $400-$800 including parts and labor.

If a heat exchanger fails in year 3:

• Camplux CX264: Covered under 6-year warranty → $0 replacement cost
• ThermoMate CZ264: Out of 1-year warranty → $400-$800 out-of-pocket

Winner: Camplux CX264 ✅✅✅

A 6× longer heat exchanger warranty isn't a marketing gimmick — it's a meaningful financial protection that could save you hundreds of dollars in the unit's first 5 years of life.

Round 6: Safety Certification — CSA Matters in the U.S.

Camplux CX264: CSA Certified for Indoor Use

The CX264 carries CSA certification for indoor gas appliance use. CSA Group is one of the three major North American safety certifying bodies (along with UL and ETL/Intertek), and CSA certification verifies the unit complies with the ANSI Z21.10.3 standard for gas-fired tankless water heaters.

Why this matters:

• Most homeowners insurance policies and building codes require a major safety certification (CSA, UL, or ETL) for indoor gas appliances
• Local permit inspectors often check for the certification mark
• Resale of your home with an uncertified indoor gas heater can become a flagged issue

ThermoMate CZ264: Certification Status

ThermoMate's product page does not explicitly specify CSA 4.3 certification. While the unit may have other certifications, the absence of clear CSA marking creates uncertainty for buyers concerned about insurance compliance and local code requirements.

Winner: Camplux CX264 ✅

For indoor installation in the U.S. and Canada, CSA certification isn't a "nice to have" — it's the standard buyers should expect at any price point.

Round 7: Safety Protections — 10 vs 8

Both heaters include multi-layer safety systems, but the CX264 includes 10 built-in protections vs the CZ264's 8:

The two additional protections on the CX264 — anti-scale buildup detection and water leakage shutoff — are especially valuable in areas with hard water or for installations in finished living spaces (apartments, condos, basements).

Winner: Camplux CX264 ✅

Round 8: What the ThermoMate CZ264 Does Have Going for It

To be fair, let's address what the CZ264 does well:

• Established Amazon presence — The CZ264 has a longer Amazon listing history and a higher review count (107 reviews vs Camplux CX264's 16 at time of writing), which some buyers prefer.
• Identical design footprint — Both units have similar wall-mount profiles and standard connections, making installation comparable.
• Same chassis quality — Both use oxygen-free copper heat exchangers and similar non-condensing burner designs.

If you're a buyer who prioritizes Amazon review count over specs, the CZ264 has more user reviews accumulated. But review count is a function of time on the market, not product quality.

Final Verdict: Which One Should You Buy?

Buy the Camplux CX264 If…

• ✅ You want higher specs at the same price
• ✅ You have modern low-flow fixtures or low water pressure
• ✅ You live in a state with cold winter inlet water
• ✅ You want a 6-year heat exchanger warranty for peace of mind
• ✅ You need CSA-certified compliance for insurance or code reasons
• ✅ You want to qualify for state energy rebates tied to UEF 0.82+

Buy the ThermoMate CZ264 If…

• ✅ Amazon review count is your primary decision factor
• ✅ You don't need CSA certification for your installation context

For the vast majority of buyers in the $299 indoor tankless segment, the Camplux CX264 is the better technical choice. Same price, better specs, longer warranty, verified safety certification.

🏆 Our Recommendation

Shop the Camplux CX264 →

• 3.18 GPM | 80,000 BTU | UEF 0.84
• CSA Certified | 6-Year Warranty
• 30-Day Money-Back Guarantee
• Free U.S. Shipping
• $299.99

Frequently Asked Questions

Is Camplux CX264 better than ThermoMate CZ264?

Yes. At the same $299.99 price point, the Camplux CX264 delivers higher flow (3.18 vs 3.06 GPM), more power (80,000 vs 75,000 BTU), better efficiency (UEF 0.84 vs 0.81), industry-leading 0.45 GPM low-flow startup (vs 0.80 GPM), CSA certification, and a 6-year heat exchanger warranty (vs 1 year).

Are Camplux and ThermoMate the same company?

No. Camplux and ThermoMate are separate brands. Camplux has been manufacturing outdoor and indoor tankless water heaters since 2008, with established U.S. distribution and customer support.

What is the warranty difference between Camplux CX264 and ThermoMate CZ264?

The Camplux CX264 offers a 6-year limited heat exchanger warranty plus 2-year limited parts warranty. The ThermoMate CZ264 lists a 1-year limited warranty in its standard package.

Is the ThermoMate CZ264 CSA certified?

ThermoMate's listing does not explicitly specify CSA 4.3 certification on its product page. The Camplux CX264 is CSA certified for indoor use, which is the standard safety certification required for North American gas-burning appliances.

Which tankless water heater is best for low-flow showerheads?

The Camplux CX264 activates at just 0.45 GPM, which is nearly half the industry standard of 0.80 GPM. This means it works reliably with modern low-flow showerheads, water-saving faucets, and homes with reduced water pressure — situations where the ThermoMate CZ264 (0.80 GPM minimum) may fail to activate.

Can I install the Camplux CX264 myself?

The CX264 is designed for DIY-friendly installation with standard 3/4 inch NPT water connections and a 120V plug. However, gas appliance installation in most U.S. states legally requires a licensed plumber or gas fitter. Camplux provides a complete installation manual; check your local code requirements before DIY installation.

Related Reading

• Best Indoor Tankless Water Heater Under $300 (2026 Picks) →
• What Is UEF Rating? Why 0.84 Beats 0.81 in Real Energy Savings →
• The Cold Water Sandwich Effect: Why It Happens (And How to Stop It) →
• Tankless Water Heater Warranty Showdown: 1-Year vs 6-Year Brands →
• Why Low-Flow Startup GPM Matters in a Tankless Water Heater →

Camplux is an authorized brand of indoor and outdoor gas tankless water heaters since 2008. All product specifications and pricing are accurate as of May 23, 2026. Comparison data sourced from official manufacturer pages, the DOE Energy Guide database, and CSA Group certification records.