Raypak AVIA 404A Gas Pool & Spa Heater

Why homeowners consider it

• Three years parts and labor on a single-family residential installation, the same term Pentair publishes on its ETi 400. Hayward gives three years parts and one year field labor as standard; Jandy gives one year parts with no labor at all. Raypak covering the labor is the difference between a free repair and a service call you pay for.
• The heat exchanger is a straight-tube design. Raypak's own literature makes the case plainly: no bends and no helical coils, which removes the spots where scale and erosion concentrate, and makes the tubes serviceable for annual maintenance rather than sealed away.
• The combustion chamber is stainless steel rather than the galvanized steel Raypak says is common in this category — a real corrosion advantage above the water line, where flue condensate does the damage.
• Wi-Fi is built in and free. Raymote gives the homeowner temperature control and a heat-time calculator on a phone, and gives a service company fleet monitoring and diagnostics, with no separate automation panel or paid subscription accessory in between.
• The ProTek Shield is a replaceable sacrificial anode in the inlet header. It protects the exchanger from galvanic and stray-current corrosion and is meant to be swapped when it is worn down — a wear part doing its job, not a failure.
• At 399,000 BTU/hr it will bring an attached spa up to temperature in the time gas heaters exist to deliver, and it does it in the same 135 lb cabinet as the 264A — the extra output costs nothing in footprint.

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 399,000 BTU/hr heater needs a gas line sized for it. Raypak's manual carries its own pipe-sizing table and requires a sediment trap on every installation; an existing line that fed a smaller heater is the most common reason a gas swap costs more than the quote.

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.