Are Outdoor Tankless Heaters Suitable For The Pacific Northwest?
Outdoor tankless water heaters can be suitable for the Pacific Northwest if installed correctly. Key factors include proper venting, protection from harsh weather, and selecting a model designed for colder climates to ensure consistent hot water even with lower ambient temperatures.
Understanding Outdoor Tankless Water Heaters
An outdoor tankless water heater, also known as an on-demand water heater, heats water only when you need it. This is different from a traditional tank heater that keeps a large amount of water hot all the time. When you turn on a hot water tap, cold water flows into the unit.
A powerful burner then heats this water as it passes through a heat exchanger.
This system means you get an endless supply of hot water. You don’t run out during long showers or when multiple appliances are running. It’s also more energy efficient because it’s not constantly using energy to maintain a tank of hot water.
This can lead to lower energy bills over time. For homes with limited indoor space, placing the heater outside is a great solution.
Why Climate Matters for Tankless Heaters
Water heaters, especially tankless ones, are affected by the temperature of the water coming into them. In colder climates, the incoming water is colder. This means the heater has to work harder to bring the water up to your desired temperature.
If a heater isn’t powerful enough, it might struggle to produce enough hot water.
This is a big concern in the Pacific Northwest. While not as extreme as some northern regions, winter temperatures can bring the incoming water temperature down significantly. The constant rain and wind can also play a role.
These elements can affect the heater’s performance and even its lifespan if not properly protected.
Can They Handle Pacific Northwest Weather?
Yes, they absolutely can, but with important considerations. Modern outdoor tankless water heaters are built with tough materials. They can withstand rain and wind.
However, the biggest challenge is the cold incoming water during winter months. Some units are better designed for colder climates than others.
Look for models that specify their performance in colder conditions. These units often have higher “rise” ratings. This means they can heat water by a larger temperature difference.
They also need proper venting to avoid issues with freezing or performance drops due to cold air drafts. Protection from direct wind can also help maintain efficiency.
Personal Experience: The Seattle Shower Scare
I remember helping a friend in Seattle set up his new home. He was so proud of his new outdoor tankless water heater. He loved that it freed up space in his small utility room.
We installed it on the side of his house, facing away from the prevailing winds, or so we thought. It was late fall, and the rain was starting to pick up.
The first few weeks were great. He bragged about never running out of hot water. Then came a cold snap.
The temperatures dipped into the low 30s. One morning, he called me in a panic. His shower wasn’t getting hot enough.
He felt like he was getting just lukewarm water. We went through all the checks: the gas supply was good, the unit was on, the settings were correct. It turned out the incoming water was so cold that his particular model, which wasn’t rated for extreme cold, couldn’t keep up with the demand for his desired temperature setting.
It was a wake-up call. We ended up having to adjust his expectation for water temperature slightly during those coldest days, or run fewer fixtures. It showed me that “cold weather ready” isn’t always the same everywhere, and the Pacific Northwest has its own brand of cold that matters.
Key Factors for PNW Performance
Gas Supply: Ensure you have a strong, consistent natural gas or propane supply. Colder weather can affect gas pressure.
Venting: Proper venting is crucial. It must expel combustion gases safely. It also needs to prevent freezing in the pipes, especially for condensate lines on condensing units.
Insulation: While the unit is outdoor-rated, some extra protection might help in extremely harsh conditions, though often not strictly needed for standard models.
Water Flow Rate: Understand the unit’s flow rate and its ability to heat water at that flow rate. This is key for consistent temperatures.
Installation is Key: Location, Location, Location
Where you put your outdoor tankless heater matters a lot. In the Pacific Northwest, you want to shield it from the worst of the elements. Avoid placing it in an area that gets direct, harsh winds.
Strong winds can blow out the pilot light (if it has one) or affect the burner’s efficiency. It can also make the unit work harder in cold temperatures.
Consider a spot that gets some morning sun, which can help warm it up slightly. However, avoid direct, constant sunlight that could overheat components. Protection from heavy rain is also important.
Many units are designed to be waterproof, but keeping them out of puddles and direct downpours is wise. A small overhang or placing it under a sturdy deck can offer good protection without hindering airflow.
Venting Challenges in a Wet Climate
Venting is one of the most critical aspects of installing an outdoor tankless heater. The unit needs to expel combustion gases safely. For outdoor units, this often means a direct-vent system.
This uses two pipes: one to bring in fresh air for combustion and another to vent out exhaust gases.
In the Pacific Northwest, condensation can be a big issue. Condensing tankless water heaters are more efficient but produce more water as a byproduct of their combustion process. This condensate must be drained properly.
If the drain line freezes, the unit can shut down. Ensuring the vent termination is protected from snow and ice buildup is also important, although less of a concern for snow in many coastal PNW areas compared to ice or heavy rain.
Condensing vs. Non-Condensing Heaters
Condensing Heaters: These are more energy efficient. They capture extra heat from exhaust gases to warm the incoming water. They produce a condensate (water) that needs a drain.
Non-Condensing Heaters: These are simpler and often less expensive. They vent hot gases directly outside without trying to recapture heat. They might be less efficient but can be a good choice where condensate drainage is difficult.
Choosing the Right Model for Cold Water
Not all tankless heaters are created equal when it comes to cold weather. When shopping for a unit, pay close attention to its specifications. Look for the “maximum temperature rise” or “delta T” rating.
This tells you how much the unit can increase the water temperature.
For example, if your incoming water is 40°F in winter and you want 120°F hot water, you need a heater that can raise the temperature by 80°F. A unit rated for a 60°F rise might struggle. You also need to check its flow rate at that temperature rise.
A higher flow rate means more hot water at the desired temperature.
Model Selection Checklist
- GPM (Gallons Per Minute): Match your household needs.
- Temperature Rise: Ensure it’s high enough for cold PNW water.
- Energy Source: Natural gas or propane?
- Energy Factor (EF): Higher is better for efficiency.
- Vent Type: Direct vent is common and often required for outdoor units.
- Cold Weather Rating: Specifically designed or tested for colder climates.
Real-World Scenarios in the PNW
Let’s think about how these heaters perform in different parts of the Pacific Northwest. Coastal areas like Seattle and Tacoma might have milder winters but experience high humidity and frequent rain. This means the unit needs good waterproofing and protection from moisture.
Inland areas, like parts of Eastern Washington or Oregon, can experience much colder winters with freezing temperatures. Here, the focus shifts to the unit’s ability to handle very cold incoming water and the risk of its condensate lines or water lines freezing. Even areas like the Willamette Valley in Oregon, while not extreme, can have sustained periods of cold, wet weather that challenge less robust models.
Scenario: Coastal Home (e.g., Astoria, OR)
Environment: High humidity, frequent rain, moderate winters, wind.
Considerations: Excellent waterproofing is essential. Protection from wind exposure is vital for consistent performance. Condensation management is key, but freezing is less of a primary concern.
Scenario: Inland Valley Home (e.g., Yakima, WA)
Environment: Colder winters, potential for freezing temperatures, lower humidity.
Considerations: Focus on a unit with a high temperature rise capability. Ensure the condensate drain line is protected from freezing. Proper insulation for the unit itself might be beneficial.
Maintenance is Crucial for Longevity
No matter where you live, regular maintenance is key for any water heater. For outdoor tankless units in the Pacific Northwest, this is even more important. You’ll want to schedule annual check-ups.
A professional will inspect the unit for any signs of wear or damage from the weather.
They will clean the filters, check the igniter and burner, and ensure the venting system is clear. Descaling is also important, especially if you have hard water. Mineral buildup can reduce efficiency and damage the heat exchanger.
The frequency of descaling depends on your water hardness. For the PNW’s often softer water, it might be less frequent than in other regions, but still necessary.
Annual Maintenance Checklist
- Inspect Venting: Check for blockages, damage, or corrosion.
- Clean Filters: Remove debris that could restrict water flow.
- Check Igniter and Burner: Ensure proper ignition and flame.
- Inspect Heat Exchanger: Look for any signs of damage or buildup.
- Test Condensate Drain (if applicable): Make sure it’s flowing freely.
- Descaling: Remove mineral deposits if needed.
- Check for Leaks: Inspect all water and gas connections.
What This Means for Your Hot Water Supply
If you’re considering an outdoor tankless water heater for your Pacific Northwest home, it’s a viable option. The main thing is to choose the right unit for the climate and ensure it’s installed by a qualified professional. They will know how to site it correctly and vent it properly for your specific location.
You might find that during the absolute coldest spells, you need to be mindful of your hot water usage. For example, avoid running the dishwasher, washing machine, and shower all at the same time. Or, you might need to slightly lower your desired shower temperature.
These are minor adjustments for the benefits of endless hot water and space savings.
When to Worry About Performance
If your outdoor tankless water heater is consistently failing to provide enough hot water, especially when it’s not extremely cold, something might be wrong. This could be a sign of a unit that’s too small for your needs or a malfunction. Persistent lukewarm water during mild weather is a red flag.
Also, listen for unusual noises from the unit. Any strange humming, banging, or clicking sounds should be investigated. Leaks are another serious sign that require immediate attention.
Don’t ignore these issues, as they can lead to bigger problems or reduced efficiency.
Quick Tips for PNW Outdoor Tankless Owners
Here are some quick tips to help your outdoor tankless heater perform well in the Pacific Northwest:
- Invest in a quality unit: Don’t skimp on the heater itself. Look for brands with good warranties and cold-weather ratings.
- Professional installation is a must: This is not a DIY job for most people, especially with venting and gas lines involved.
- Understand your unit’s limits: Know what temperature rise it can achieve and what your typical incoming water temperature is.
- Perform regular maintenance: An annual check-up can prevent many issues.
- Protect from the elements: Even if it’s outdoor-rated, a little extra shelter can go a long way.
- Monitor performance: Pay attention to how your hot water is performing, especially as seasons change.
Frequently Asked Questions
Will an outdoor tankless water heater freeze in the Pacific Northwest?
Outdoor tankless water heaters are designed to withstand outdoor conditions, but freezing is still a risk, especially for condensate lines on condensing models during prolonged cold snaps. Proper installation, including ensuring condensate drains are clear and protected, helps prevent this. Some units have freeze protection features.
How much colder is the incoming water in winter in Seattle?
In Seattle, the incoming water temperature from the city supply can drop significantly in winter, often to around 40°F (4°C) or even lower, compared to summer temperatures that might be in the 60s°F (15-20°C). This large temperature difference requires a powerful heater.
Can I install an outdoor tankless heater myself?
It is generally not recommended for homeowners to install an outdoor tankless water heater themselves. These units involve complex gas lines, venting, and electrical connections. Professional installation by a licensed plumber or HVAC technician ensures safety, code compliance, and optimal performance.
How do I protect my outdoor tankless heater from rain?
Most outdoor tankless units are designed to be weather-resistant and waterproof. However, installing the unit in a location that offers some natural shelter, such as under a deck overhang or on a wall that isn’t exposed to driving rain, can provide extra protection and potentially improve longevity.
What is the best type of tankless heater for cold climates?
For cold climates like parts of the Pacific Northwest, condensing tankless water heaters are often preferred due to their higher efficiency. Crucially, select a model with a high temperature rise capability (e.g., 70°F or more) and sufficient flow rate (Gallons Per Minute – GPM) to handle very cold incoming water and your household demand.
Do outdoor tankless heaters need more maintenance in the PNW?
While all tankless heaters benefit from regular maintenance, the damp and sometimes harsh conditions in the Pacific Northwest mean that annual professional inspections are highly recommended. Checking for corrosion, ensuring vents are clear, and verifying proper operation in varying temperatures are key.
Conclusion
So, are outdoor tankless water heaters suitable for the Pacific Northwest? The answer is a resounding yes, with the right preparation. By understanding your local climate, choosing a capable unit, and ensuring professional installation and maintenance, you can enjoy the benefits of on-demand hot water even in this beautiful, often wet, region.
