A bradford white ultra high efficiency water heater uses condensing technology to achieve up to 96% efficiency by capturing heat from exhaust gases. It features a submerged combustion chamber and advanced electronic controls to maximize energy savings and hot water delivery.
High-efficiency water heating has moved from a luxury upgrade to a standard for homeowners looking to slash utility bills. The Bradford White Ultra High Efficiency (UHE) series represents the pinnacle of this shift, utilizing condensing technology to extract every possible BTU from the fuel source.
Unlike traditional atmospheric heaters that lose significant heat through the chimney, these units recycle exhaust gases. This process significantly lowers the temperature of the air leaving your home while maximizing the temperature of the water inside the tank.
Understanding how these complex machines operate is essential for proper maintenance and long-term reliability. Whether you are looking to install one or need to troubleshoot a fault code, knowing the internal mechanics of a bradford white ultra high efficiency water heater will save you time and money.
How a bradford white ultra high efficiency water heater Works
The core of the UHE system is its condensing heat exchanger. In a standard water heater, hot combustion gases pass through a center flue and exit the home quickly, carrying away about 20% of the energy produced.
The ultra-high-efficiency model uses a secondary heat exchange process. The exhaust is routed through a stainless steel coil submerged in the tank, allowing the water to absorb heat from the flue gases until they condense into liquid form.
By the time the exhaust reaches the power vent blower motor, it is cool enough to be vented through inexpensive PVC or CPVC pipe. This design allows the unit to achieve a Uniform Energy Factor (UEF) that far exceeds standard residential requirements.
The Submerged Combustion Chamber
The burner is located within a submerged combustion chamber at the center of the tank. This placement ensures that heat is transferred 360 degrees into the surrounding water, minimizing heat loss through the bottom of the unit.
This design also reduces the “standby loss” commonly associated with older models. Because the combustion area is surrounded by water, the outer jacket of the heater remains cool to the touch even during heavy use.
Key Components of the UHE Series
To achieve such high levels of efficiency, Bradford White integrates several advanced mechanical and electronic parts. These components work in a specific sequence to ensure safe and reliable ignition.
One of the most important parts is the Honeywell integrated control valve. This serves as the “brain” of the heater, monitoring water temperature and managing the electronic ignition electrode to start the burner without a standing pilot light.
The Power Vent Blower Motor
Because the exhaust gases are too cool to rise naturally through a chimney, a power vent blower motor is required. This motor pulls the air through the combustion system and pushes it out of the vent pipe.
The blower also includes a pressure switch assembly. This safety device ensures the fan is moving enough air to safely vent the unit before the gas valve is allowed to open.
Advanced Protection Features
Most UHE models come equipped with a powered anode rod. Unlike traditional sacrificial anodes made of magnesium or aluminum, the powered version uses a small electrical current to prevent tank corrosion.
This is a significant advantage for homeowners with “smelly water” issues caused by sulfate-reducing bacteria. The powered anode does not degrade over time, providing permanent protection for the glass-lined tank.
Installation Requirements and Constraints
Installing a bradford white ultra high efficiency water heater is more involved than swapping out a standard gas unit. Because these units produce acidic condensation during the heating process, you must have a plan for drainage.
A condensate neutralizer kit is often required by local building codes. This kit contains marble chips or similar alkaline media that raise the pH of the water before it enters your home’s PVC drainage system or floor drain.
Venting and Air Intake
These heaters are typically “direct vent” or “power vent” compatible. You can pull combustion air from inside the room or pipe it in from the outside using a dual-pipe system.
Always use the specified schedule of PVC or CPVC pipe mentioned in the manual. Using incorrect venting materials can lead to pipe sagging or joint failure due to the constant presence of moisture in the exhaust.
Thermal Expansion Management
Because these units are often installed in “closed” plumbing systems with check valves or pressure-reducing valves, a thermal expansion tank is mandatory. This small tank absorbs the extra pressure created when water expands as it heats up.
Failure to install an expansion tank can lead to the T&P (Temperature and Pressure) relief valve leaking. Over time, constant high pressure can also weaken the internal welds of your high-efficiency heater.
Maintaining Your High-Efficiency Unit
Regular maintenance is the only way to ensure your heater reaches its expected 10-to-15-year lifespan. The most critical task is checking the condensate drain line for clogs or algae buildup.
If the condensate cannot escape the unit, it will back up into the heat exchanger. This can cause the burner to misfire or lead to premature corrosion of the stainless steel components.
Cleaning the Ignition System
The electronic ignition electrode and the flame sensor should be inspected every two years. Carbon buildup on these sensors can prevent the unit from detecting a flame, leading to a “lockout” state.
You can gently clean the flame sensor with a piece of fine steel wool or a clean cloth. Be careful not to bend the mounting bracket, as precise alignment is necessary for the spark to jump to the burner surface.
Flushing the Tank
Even with high-efficiency designs, sediment can settle at the bottom of the tank. This is especially true in areas with hard water, where calcium and lime deposits can insulate the heat exchanger.
Drain at least a few gallons of water from the bottom drain valve every six months. If the water appears cloudy or contains “sand,” perform a full flush until the water runs clear to maintain optimal heat transfer.
Troubleshooting Common Fault Codes
The Honeywell control valve on a bradford white ultra high efficiency water heater uses an LED light to communicate its status. Understanding these blink codes is the fastest way to diagnose a problem.
If the light is blinking a specific sequence, refer to the chart on the side of the heater. Most issues involve the pressure switch or the ignition sequence, which are often easy to resolve without a full component replacement.
| LED Status | Potential Cause | Recommended Action |
|---|---|---|
| 2 Blinks | Pressure switch stuck closed | Check wiring; replace pressure switch if faulty. |
| 3 Blinks | Pressure switch failed to close | Check for vent obstructions or blower failure. |
| 6-1 Blinks | Ignition failure (Soft Lockout) | Clean flame sensor; check gas supply pressure. |
| 7 Blinks | Flammable vapor sensor tripped | Ventilate area; reset sensor after clearing fumes. |
Before replacing the blower motor or pressure switch, always check the exterior vent terminations. Birds often build nests in the PVC pipes during the spring, which creates enough backpressure to trip the safety sensors.
Addressing Sensor Errors
The flue gas temperature sensor is another critical safety component. If the exhaust gets too hot, the sensor will shut down the unit to prevent the PVC venting from melting.
This usually happens if the heat exchanger is heavily scaled or if the water level in the tank is low. Ensure the tank is completely full of water before restoring power to the unit after maintenance.
Is an Ultra-High-Efficiency Heater Right for You?
While the energy savings are undeniable, these units carry a higher upfront cost than standard models. They are best suited for households with high hot water demand, such as those with large soaking tubs or multiple teenagers.
The installation also requires a nearby drain and a way to vent through a side wall. if your current water heater is in the middle of a basement far from an exterior wall, the cost of running new PVC venting may outweigh the energy savings.
However, for those looking to “future-proof” their home and reduce their carbon footprint, the Bradford White UHE series is a top-tier choice. The combination of professional-grade construction and advanced electronics makes it a reliable workhorse for modern homes.
Frequently Asked Questions
Does this water heater require electricity to run?
Yes, because it uses a power vent blower and electronic ignition, it must be plugged into a standard 120V outlet. In the event of a power outage, the heater will not produce hot water unless connected to a backup generator or UPS.
How often should I replace the condensate neutralizer?
The media inside the neutralizer kit (usually crushed marble or limestone) typically lasts about one year. You should check it annually and replenish the media if it has dissolved significantly to prevent acidic water from damaging your pipes.
Why is my water heater making a gurgling sound?
Gurgling usually indicates that the condensate drain is partially blocked or that there is a “trap” in the venting that is collecting water. Ensure the drain lines are clear and that the vent pipes have a slight slope back toward the heater as specified in the manual.
Can I install this unit myself?
Due to the complexities of gas manifold pressures, specialized venting requirements, and electronic controls, Bradford White strongly recommends professional installation. Improper installation can void the warranty and create safety hazards like carbon monoxide leaks.
Summary of Practical Takeaways
Maintaining a bradford white ultra high efficiency water heater requires a shift in mindset from traditional “set it and forget it” models. By monitoring the condensate system and keeping the air intake clear, you can enjoy decades of low-cost hot water.
If you encounter a fault code, start with the basics: check the vent pipes for obstructions and ensure the condensate drain isn’t backed up. These simple steps resolve the majority of “no hot water” calls without the need for expensive replacement parts.