Raypak AVIA HD 404A with NiTek Gas Pool & Spa Heater

Why homeowners consider it

• NiTek is the reason to buy this one. Raypak publishes it as 300% more erosion resistant than copper and 200% more than cupro-nickel, based on ASTM G73-10 (2017) liquid-impingement erosion testing, and offers it on HD models specifically.
• The corrosion upgrade costs nothing in efficiency. Raypak lists the NiTek and copper AVIA models at the same 84% thermal efficiency and the same 399,000 BTU/hr input — unlike Jandy, whose cupro-nickel JXI400NN is labeled a point lower than the copper version.
• Raypak's warranty covers HD NiTek models on the same terms as the copper ones: three years parts and labor on a residential single-family installation, the same term Pentair publishes on its ETi 400.
• The straight-tube geometry is the other half of the durability story. No bends and no helical coils means fewer places for scale and erosion to concentrate, and the tubes stay accessible for annual maintenance.
• Everything else is the AVIA package: stainless steel combustion chamber, ProTek Shield replaceable anode in the inlet header, free built-in Raymote Wi-Fi, and a cabinet built to drop into the plumbing and gas connections of the heater it replaces.

What to know before buying

• The ProTek Shield anode is a consumable and the warranty excludes it outright. Raypak's exclusion 12 states the shield is not covered under any warranty, that it will need replacing as part of routine service, and — the part that matters — that the warranty does not cover damage caused to the heater by a depleted ProTek Shield that has not been replaced as needed. Budget for checking and replacing it as annual maintenance, because neglecting a cheap part can cost you the exchanger cover.
• Minimum flow is 40 GPM, which is higher than most of its competition — Jandy and Hayward gas heaters will run at 30. On a variable-speed pump that pushes the heating speed up, and it is worth checking against your plumbing before assuming a straight swap.
• Natural gas models are approved to 10,000 feet of elevation but propane models only to 4,500 feet, and propane needs a higher inlet pressure: 8.0 inches W.C. dynamic minimum against 3.5 inches for natural gas. Irrelevant for altitude on the Gulf Coast, relevant for how the gas train has to be set up.
• Raypak's warranty is conditional on buying from an authorized dealer, and it explicitly reserves the right to reject claims on heaters bought from unauthorized internet sites or marketplace storefronts. On a heater whose main selling point is its warranty, that condition is the whole ballgame.
• The labor cover has edges. Raypak pays for the repair labor but not travel time, freight or fuel, so a warranty repair is not always a zero-dollar visit.
• Raypak does not recommend prolonged operation with water below 50°F, and asks that a heater started with water that cold be run continuously until the water warms — a note for anyone bringing a long-dormant pool back up in January.
• AVIA is a comparatively recent platform. Raypak's own brochure describes it as a new, Pool-Pro-driven design rather than a long-running one, which is worth weighing against the deep field history behind a Universal H-Series or a MasterTemp. We could not verify any third-party review sample for it from a source we were able to fetch, so we are not quoting one.
• A better exchanger is not a license to ignore water chemistry. Raypak's warranty excludes damage from corrosive water, and NiTek buys margin rather than immunity — the salt cell or chlorinator still belongs downstream of the heater.
• Check which heater you are actually being quoted. The copper and NiTek versions look identical and differ only in the last letter of the model number: P-R404A-EN-C (catalog 018033) is copper, P-R404A-EN-N (catalog 018045) is NiTek.

Warranty, term by term

The warranty only matters on the parts that actually fail. Here is how this one splits up.

Why the heat exchanger matters

How we scored it

Real Modern Pool Heating installations

We have not published a job-site photo for this exact model yet. Installation photos on this site are only ever our own work, and we label each one as the exact model or as a representative install.