Raypak AVIA 264 vs 404
Both heaters share the AVIA platform, Raymote connectivity and 84% thermal efficiency. The real decision is how much heating capacity your pool, spa, climate and gas supply actually require.
```Choose the Raypak AVIA 264 when the pool is moderate in size, heat-up speed is not the highest priority and the available gas supply is better suited to a 264,000 BTU heater. Choose the AVIA 404 when you have a larger pool, an attached spa, frequent cold-start heating, cooler weather or a strong preference for faster recovery. The larger heater only makes sense when the gas meter, regulator, piping, water flow and installation can support it.
Customers often ask for a simple gallon cutoff between the AVIA 264 and 404. Gallons matter, but they are not enough to size a heater correctly.
Two pools can hold the same amount of water and have very different heating demands. A shallow pool with a large exposed surface can lose more heat than a deeper pool with less surface area. Wind, overnight temperature, humidity, cover use and the desired water temperature all affect how hard the heater must work.
AVIA 264 and 404 Side by Side
```| Specification | AVIA 264 | AVIA 404 |
|---|---|---|
| Published input | 264,000 BTU/hr | 399,000 BTU/hr |
| Thermal efficiency | 84% | 84% |
| Approximate useful output | About 221,760 BTU/hr | About 335,160 BTU/hr |
| Water connections | 2-inch buttress | 2-inch buttress |
| Published flow range | 40 to 100 GPM | 40 to 100 GPM |
| Gas options | Natural gas or propane | Natural gas or propane |
| Heat-exchanger options | Copper or NiTek | Copper or NiTek |
| Typical reason to choose | Moderate demand and lower initial cost | Faster recovery and greater heating demand |
- 264,000 BTU input
- Good fit for many moderate residential pools
- Lower hourly fuel demand than the 404
- May fit gas infrastructure that cannot support the larger heater
- Longer heat-up time than the 404 under comparable conditions
- 399,000 BTU input
- Better suited to larger pools and attached spas
- Faster theoretical heat-up under comparable conditions
- Useful in cooler, windier or more demanding applications
- Requires a gas system capable of supporting the larger input
Six Factors That Determine the Correct AVIA Size
```Pool Volume
More water requires more energy for every degree of temperature increase.
Surface Area
The exposed water surface is where a large share of pool heat loss occurs.
Temperature Rise
Heating from 60°F to 82°F is a much larger job than maintaining 78°F to 82°F.
Wind and Weather
Wind, cool air and dry conditions can rapidly increase evaporation and heat loss.
Pool Cover
A properly used cover can reduce evaporative and overnight heat loss substantially.
Spa Use
An attached spa often shifts the decision toward the larger heater because fast recovery matters.
How Much Faster Is the AVIA 404?
```Because both models are rated at 84% thermal efficiency, the AVIA 404 delivers approximately 51% more useful heat output per hour than the AVIA 264 under comparable ideal conditions.
Simple theoretical heating formula
This formula provides an idealized estimate. It does not account for wind, evaporation, uncovered water, cool plumbing, environmental losses or changing outdoor conditions.
AVIA 404: approximately 2.5 ideal hours
AVIA 404: approximately 3.7 ideal hours
AVIA 404: approximately 5.0 ideal hours
The Gas Line Can Decide the Heater Size
```A homeowner may want the AVIA 404 but have a gas system that cannot reliably supply a 399,000 BTU appliance at the required dynamic pressure.
Gas-pipe capacity depends on fuel type, pipe material, pipe diameter, equivalent length, fittings, regulator arrangement, meter capacity and the demand from other appliances. A qualified gas professional must evaluate the actual installation.
Does the AVIA 404 Cost More to Operate?
```The AVIA 404 burns fuel at a higher hourly rate while firing, but it also heats the pool faster. That does not mean the total cost of achieving the same temperature rise increases in direct proportion to the heater’s input.
In an ideal system, heaters with the same thermal efficiency require a similar total quantity of fuel to add the same amount of heat to the same volume of water. The larger heater delivers that heat in less time.
Real-world cost still varies because of weather, cycling, standby losses, plumbing, fuel rates and how the homeowner uses the pool. The practical question is whether the faster recovery of the 404 is worth the higher equipment price and potentially greater gas-infrastructure requirements.
```Real-World AVIA Sizing Scenarios
```Scenario 1: Moderate pool maintained throughout the season
A homeowner has a moderate in-ground pool, uses a cover, keeps the water near the desired temperature and does not have an attached spa.
Likely direction: The AVIA 264 may be sufficient when a proper heat-loss evaluation and the available gas supply support it.
Scenario 2: Larger Northeast pool heated mainly on weekends
The pool cools during the week and needs a substantial temperature increase before Friday evening. Spring and fall operation are important.
Likely direction: The AVIA 404 may be the stronger choice because recovery speed is a major part of the homeowner’s goal.
Scenario 3: Pool with an attached spa
The pool itself is not extremely large, but the homeowner expects the spa to heat quickly for evening use.
Likely direction: The AVIA 404 is often attractive because spa recovery changes the sizing priorities.
Scenario 4: Larger heater requested but gas service is limited
The homeowner wants the fastest model, but the existing meter and long gas run may not support 399,000 BTU without upgrades.
Likely direction: Resolve gas capacity before selecting. The 264 may be more practical, or the site may require professional gas-system modifications.
A Better Way to Choose Between the 264 and 404
```Raypak AVIA 264 vs 404 Frequently Asked Questions
```What size pool can an AVIA 264 heat?
Is the AVIA 404 too large for a small pool?
Does the AVIA 404 use more gas?
Are the AVIA 264 and 404 the same physical size?
Should Northeast pool owners automatically choose the 404?
Does a pool cover affect heater sizing?
Still Deciding Between the AVIA 264 and 404?
Send Aqua Terra Backyard your pool dimensions, approximate gallons, gas type, ZIP code, desired water temperature, attached-spa information and equipment-pad photos. We can help identify the more appropriate AVIA configuration before you purchase.
``` Shop Gas Pool Heaters Request Sizing Help ```Heating-time examples are theoretical estimates based on published input and thermal efficiency. Actual performance varies. Heater sizing and gas-system evaluation should be completed by qualified professionals using current manufacturer documentation and local requirements.