Pool Heater Ignition: Standing Pilot vs Electronic

What an ignition system does in a gas pool heater

A gas pool heater burns natural gas or propane to warm the water. The ignition system is the part that lights the burner when the thermostat calls for heat. In a listing, the ignition type is a feature word that tells you how the heater starts its flame.

There are two main families: standing pilot and electronic ignition. A standing pilot keeps a small flame burning at all times. Electronic ignition lights the burner only when needed, using a spark or a hot surface. Each has a different set of parts and a different way of starting.

The ignition system does not affect the heater's BTU output or the pool type it serves. It is a separate feature from the heat exchanger, the gas valve, and the thermostat. When comparing heaters, the ignition type is one of several details to read in the listing. For a full comparison, see the best natural gas pool heaters guide.

Standing pilot ignition

A standing pilot system uses a small, continuous flame to ignite the main burner. The pilot flame burns between heating cycles, so the heater is ready to light the moment the thermostat calls for heat. This design has been used for decades and is known for its simplicity.

In a listing, a standing pilot may be described as "standing pilot," "pilot light," or simply "pilot." Some older models and budget-friendly heaters use this system. Because the pilot flame burns constantly, the heater uses a small amount of gas even when it is not heating the pool.

The main advantage of a standing pilot is its straightforward operation. There are fewer electronic parts to fail, and the heater does not rely on a control board to start. The trade-off is the continuous gas consumption and the need to relight the pilot if it goes out. If you prefer this simpler system, look for heaters in the best propane pool heater guide.

Electronic ignition systems

Electronic ignition systems light the burner only when the heater needs to produce heat. They use a control module that sends a spark or heats a surface to ignite the gas. Because the pilot flame is not burning continuously, these systems use less gas when the heater is idle.

There are several types of electronic ignition. An intermittent pilot lights a small pilot flame only when heat is needed, then shuts it off. A direct spark ignition lights the main burner directly with a spark. A hot surface ignition uses a glowing element to ignite the gas. In a listing, you may see "electronic ignition," "intermittent pilot," "direct spark," or "hot surface ignition."

Electronic ignition is common on newer gas pool heaters, especially high-efficiency models. It requires a control board and a power source, so the heater must be connected to electricity. This is a key difference from a standing pilot, which can operate without electrical power for the ignition itself. For high-efficiency options, check the best inground pool heater guide.

How to read the ignition type in a listing

When you look at a gas pool heater listing, the ignition system is usually stated in the title or the bullet list. Words like "standing pilot" or "electronic ignition" are feature words that describe how the heater starts. If the listing does not mention the ignition type, the seller may not state it.

Some listings use the term "millivolt" for standing pilot systems. A millivolt heater uses a small thermocouple to generate electricity from the pilot flame, which operates the gas valve without external power. This is a common way to describe a standing pilot heater.

For electronic ignition, the listing may say "electronic ignition" without specifying the type. That is enough to know the heater uses a control module rather than a continuous pilot. If the type matters to you, check the maker's manual or contact the seller for the specific ignition method. To compare models by stated details, see the best above ground pool heater guide.

Efficiency and reliability in general terms

The ignition system affects how much gas the heater uses when it is not heating. A standing pilot burns gas continuously, so it uses fuel even in standby. An electronic ignition does not burn gas between cycles, so it avoids that standby consumption. This is a general difference, not a measured claim about a specific model.

Reliability depends on the parts and the installation. A standing pilot has fewer electronic components, which some owners find simpler to maintain. An electronic ignition has a control board and sensors that can fail, but it also avoids the issue of a pilot flame being blown out by wind.

This site does not rate the reliability of specific heaters. The ignition type is one of many features to consider. For a full comparison, read the maker's manual and ask an installer about the heater's service history. For high-output models, see the best 400,000 BTU pool heater guide.

What to pick for your situation

The choice between standing pilot and electronic ignition depends on your priorities. If you want a simpler system with fewer electronic parts, a standing pilot may be a good fit. If you prefer a heater that uses no gas in standby, an electronic ignition model is worth considering.

Both systems are available on natural gas and propane pool heaters. The ignition type does not change the fuel type or the BTU rating. When you compare listings, note the ignition type alongside the BTU figure and the pool type the heater is designed for.

For a gas heater, the ignition system is one of several features to read. The BTU output, the fuel type, and the pool type are also important. Use the buying guides to compare models by these stated details.

What to pick for your situation

Questions

What is a standing pilot on a pool heater?

A standing pilot is a small flame that burns continuously in a gas pool heater. It ignites the main burner when the thermostat calls for heat. This system is simple and has few electronic parts, but it uses gas even when the heater is not heating.

What is electronic ignition on a pool heater?

Electronic ignition is a system that lights the burner only when heat is needed. It uses a control module to create a spark or heat a surface to ignite the gas. This avoids the continuous gas consumption of a standing pilot.

Which ignition system is more reliable?

Reliability depends on the specific model and installation. A standing pilot has fewer electronic parts, while an electronic ignition has a control board that can fail. This site does not rate reliability; check the maker's manual and ask an installer.

Does the ignition type affect the heater's BTU output?

No. The ignition system is separate from the burner and heat exchanger. The BTU output is determined by the burner size and gas input, not by how the burner is ignited.

Can a standing pilot heater work without electricity?

Some standing pilot systems use a millivolt thermocouple to operate the gas valve without external power. However, the heater may still need electricity for other components like the thermostat or pump. Check the listing and the maker's manual for power requirements.