When choosing a water heater for your home, consider newly available plastic options. This Old House plumbing and heating expert Richard Trethewey explores the pros and cons, helping you decide whether it’s a smart choice for your home.
How Plastic Water Heaters Work
Plastic water heaters function similarly to steel heaters. They heat and store water in a tank, ready for use when you turn on a hot water tap. The key difference in setup is the material used for the tank itself, which is typically a high-strength polymer.
Benefits of Plastic Water Heaters
Plastic water heaters offer several advantages over traditional models:
- Corrosion resistance: The plastic tank is immune to rust and corrosion, a common issue with steel tanks.
- Lightweight: These units are significantly lighter than steel tanks, making installation and replacement easier.
- Energy efficiency: Many plastic water heaters include improved insulation, helping with energy savings.
- Lifetime warranty: Some manufacturers offer lifetime warranties on the tank itself, providing homeowners with peace of mind.
In addition to these practical benefits, plastic water heaters can also be advantageous in homes located in coastal areas or regions with highly mineralized water.
Cost Considerations for Plastic Water Heaters
One of the most significant factors to consider when evaluating plastic water heaters is the cost. Today, a 30- to 50-gallon plastic water heater averages around $1,600–$1,800, which is two to three times more expensive than many traditional steel tank models. However, given plastic’s corrosion resistance and energy efficiency, you may come out better financially in the long run.
Evaluating Cost-Effectiveness
To determine if a plastic water heater is cost-effective for your situation, consider the following:
- How long you plan to stay in your home
- Your current energy costs
- Your existing water heater’s efficiency
- Local water quality and its impact on tank longevity
You should also think about the warranty included with the water heater and the availability of spare parts. The potential savings tied to reduced maintenance needs should also be factored in. Look into whether your area has history-related issues that could impact metallic tanks, such as high levels of chloramine in the water supply, which can accelerate corrosion in steel tanks.
Energy Efficiency Comparison for Plastic Water Heaters
Plastic water heaters are generally comparable to slightly more efficient than well-insulated steel tank models. Efficiency can vary depending on the manufacturer and model.
Energy Factor (EF) Rating
When comparing water heaters, look for the Energy Factor (EF) rating. This number indicates the unit’s overall efficiency, with higher numbers representing greater efficiency. Plastic water heaters often have more competitive EF ratings compared to traditional models.
Impact on Energy Bills
Homes that use lots of hot water may benefit more from plastic water heaters’ improved insulation, since they’ll experience reduced heat loss even during high usage periods.
Fuel Type Limitations for Plastic Water Heaters
One important consideration when evaluating plastic water heaters is the limitation on fuel types. These tanks are typically only available for electric models.
Electric-Only Options
Plastic water heaters are generally designed with electricity as the fuel source. This limitation may impact homeowners who prefer or require gas-powered water heaters.
Implications for Homeowners
The electric-only nature of plastic water heaters means the following:
- Homeowners with existing gas water heaters may need to switch to electric
- Installation may require electrical upgrades in some homes
- Energy costs may vary depending on local electricity rates compared to gas prices
Before deciding, homeowners should evaluate current electric costs and consult with a professional to understand the extent of electrical upgrades required. If switching from gas to electric, note additional installation costs and potential changes needed to integrate the new unit safely and efficiently within your home’s current electrical framework.
Maintenance and Longevity for Plastic Water Heaters
While plastic water heaters boast impressive durability, they still require some maintenance to ensure optimal performance and longevity.
Tank Durability
The plastic tank itself is highly corrosion- and rust-resistant, which are common issues with steel tanks. This durability is often backed by a lifetime warranty from the manufacturer.
Component Replacement
Although the tank may last a lifetime, other components of the water heater will still require periodic replacement. Metallic parts of the tank are typically not covered under the lifetime warranty and may need replacement every five to six years.
Professional Servicing
When considering a plastic water heater, ensure that local plumbers are familiar with and comfortable servicing these units. Some professionals may have limited experience with plastic models, which could impact maintenance and repair options.
Aside from the tank itself, other water heater components, such as the heating elements and thermostats, may need occasional servicing or replacement. Check the warranty details for these parts and consult with a local expert on service plans to keep your water heater functioning optimally.
Plastic Water Heater Installation Considerations
Installing a plastic water heater may differ slightly from traditional steel tank models. Here are some key factors:
- Weight: Plastic tanks are lighter, which can make installation easier in some situations.
- Space requirements: Ensure you have adequate space for the new unit, as dimensions may differ from your current water heater.
- Electrical requirements: If switching from gas to electric, you may need to upgrade your electrical system.
- Local codes: Check with your local building department to ensure compliance with all relevant codes and regulations.
Plastic water heaters might also come with some unique installation requirements due to their construction material. For instance, certain types of fittings or installation supports may be needed to securely mount the tank. Consulting the manufacturer guidelines can offer insights into installing these units efficiently and safely.
Environmental Impact of Plastic Water Heaters
Plastic water heaters may have some environmental advantages over traditional steel tanks. While not as easily recyclable as steel, many plastic components can be recycled at the end of the unit’s life.
Plastic water heaters can also lessen the environmental impact by reducing replacement frequency. Steel tanks need more frequent replacements, adding to landfill waste. Plastic water heaters’ longevity may contribute to less waste and a lower carbon footprint.
