Tankless water heaters are great. They give you hot water on demand, saving energy and space. But they’re also a bit delicate; hard water and sediment can wreak havoc on their internal components, leading to costly repairs or even a complete replacement. That’s where a good water filter comes in. It’s an investment that protects your investment, ensuring your tankless heater lasts for years to come. I’ve put together a list of some of the best water filters for tankless water heaters to help you choose the right one.
Product Overview / Quick Summary:
- iSpring WSP-50 Reusable Spin Down Sediment Filter: Excellent pre-filter for removing large particles.
- Rusco RUS-HS-1-F Sediment Filter: Durable and clear housing for easy monitoring.
- 3M Aqua-Pure Whole House Water Filter System: A complete system for taste, odor, and sediment reduction.
- Culligan WH-HD200-C Whole House Heavy Duty Water Filter: Economical choice with readily available replacement filters.
- Aquasana EQ-AST-WH Whole House Salt-Free Water Conditioner: Salt-free conditioning to prevent scale buildup.
Top 5 Best Water Filters for Tankless Water Heaters
iSpring WSP-50 Reusable Spin Down Sediment Filter
The iSpring WSP-50 is a pre-filter designed to capture sediment, rust, and other large particles before they reach your tankless water heater. It features a reusable filter screen that you can easily clean, saving you money on replacement filters.
Pros:
- ✅ Reusable and easy to clean filter screen.
- ✅ Transparent housing allows for visual monitoring of sediment buildup.
- ✅ Protects plumbing and appliances from damage caused by sediment.
Cons:
- ❌ Only filters sediment; does not address hard water issues.
- ❌ Requires manual cleaning of the filter screen.
- ❌ May reduce water flow slightly depending on sediment load.
Verdict: A great choice as a first line of defense against sediment for those on well water or with older plumbing.
Rusco RUS-HS-1-F Sediment Filter
Rusco filters are known for their durability and clear housings. The RUS-HS-1-F effectively removes sediment and debris from your water supply, protecting your tankless water heater from damage. You can see when it needs cleaning, making maintenance straightforward.
Pros:
- ✅ Durable construction for long-lasting performance.
- ✅ Clear housing allows for easy visual inspection of the filter.
- ✅ Available in various micron sizes to suit different needs.
Cons:
- ❌ Primarily for sediment removal; doesn’t address hard water or chemical contaminants.
- ❌ Requires periodic cleaning of the filter screen.
- ❌ Can be a bit bulky compared to some other filters.
Verdict: A robust and reliable sediment filter, especially useful if you want to visually monitor your water quality.
3M Aqua-Pure Whole House Water Filter System
The 3M Aqua-Pure system is more than just a sediment filter. It reduces chlorine taste and odor, sediment, and scale buildup. This filter offers comprehensive protection for your tankless water heater and improves the overall quality of your water.
Pros:
- ✅ Reduces chlorine taste and odor for better-tasting water.
- ✅ Filters sediment and scale buildup.
- ✅ Relatively easy to install and maintain.
Cons:
- ❌ Filter cartridges need to be replaced periodically, adding to the cost.
- ❌ May not be as effective at removing very fine particles as some dedicated sediment filters.
- ❌ Can slightly reduce water pressure.
Verdict: Good if you want better-tasting water along with sediment and scale protection.
Culligan WH-HD200-C Whole House Heavy Duty Water Filter
The Culligan WH-HD200-C is a budget-friendly option that provides basic sediment filtration for your entire home. It’s a simple and effective way to protect your tankless water heater from damage caused by dirt and debris.
Pros:
- ✅ Affordable and readily available filter cartridges.
- ✅ Easy to install and maintain.
- ✅ Provides basic sediment filtration.
Cons:
- ❌ Doesn’t address hard water or other water quality issues.
- ❌ May require more frequent filter changes depending on water quality.
- ❌ Not as durable as some higher-end filters.
Verdict: A solid choice for basic sediment filtration on a budget.
Aquasana EQ-AST-WH Whole House Salt-Free Water Conditioner
The Aquasana EQ-AST-WH isn’t a filter; it’s a salt-free water conditioner. It prevents scale buildup without using salt or chemicals, which is great for tankless water heaters. This system can extend the life of your appliances and plumbing.
Pros:
- ✅ Prevents scale buildup without salt or chemicals.
- ✅ Doesn’t require backflushing or regeneration.
- ✅ Environmentally friendly.
Cons:
- ❌ Doesn’t actually filter sediment or other contaminants.
- ❌ More expensive upfront than traditional filters.
- ❌ Effectiveness can vary depending on water hardness levels.
Verdict: Perfect if you’re primarily concerned about scale buildup and want a salt-free solution.
Buying Guide
Choosing the right water filter for your tankless water heater involves a few key considerations. Here’s what to keep in mind:
- Water Quality: Get your water tested. Knowing what’s in your water (sediment, hardness, chlorine, etc.) will help you choose the right filter or combination of filters.
- Filter Type: Sediment filters remove dirt, rust, and sand. Carbon filters improve taste and odor by removing chlorine and other chemicals. Water conditioners prevent scale buildup. Consider a multi-stage system if you have multiple issues.
- Flow Rate: Make sure the filter can handle the flow rate of your tankless water heater. A filter with a low flow rate can reduce water pressure.
- Micron Rating: The lower the micron rating, the smaller the particles the filter can remove. A 5-micron filter is generally good for sediment.
- Maintenance: How often will you need to change or clean the filter? Some filters are reusable, while others require replacement cartridges. Factor in the cost and hassle of maintenance.
- Installation: Can you install the filter yourself, or will you need a plumber? Consider the installation costs when budgeting.
- Filter Size and Housing: Ensure the filter size and housing are compatible with your plumbing setup. Some filters are more compact than others, which can be important if you have limited space.
For example, my parents live out in the country and have well water. They really needed a good sediment filter (like the iSpring or Rusco) before anything else. City dwellers might prioritize a carbon filter to remove chlorine.
FAQs
Q: How often should I change my water filter?
A: It depends on the type of filter and the quality of your water. Sediment filters may need to be cleaned or changed every few months, while carbon filters can last 6-12 months. Always follow the manufacturer’s recommendations.
Q: Can I install a water filter myself?
A: Many whole-house water filters are relatively easy to install with basic plumbing skills. However, if you’re not comfortable working with plumbing, it’s best to hire a professional.
Q: Do I need a water softener if I have a tankless water heater?
A: If you have hard water, a water softener or salt-free conditioner is highly recommended to prevent scale buildup and extend the life of your tankless water heater.
Q: What’s the difference between a water filter and a water conditioner?
A: A water filter removes contaminants from the water, while a water conditioner prevents scale buildup without removing minerals. They address different issues.
Q: Can I use multiple water filters in series?
A: Yes, using multiple filters in series (e.g., a sediment filter followed by a carbon filter) can provide more comprehensive water filtration.
Conclusion
Protecting your tankless water heater with a good water filter is a smart move. It can save you money on repairs and extend the life of your appliance. Consider your water quality, budget, and maintenance preferences when choosing a filter. Whether you go for a simple sediment filter or a more comprehensive whole-house system, you’ll be glad you took the time to invest in water filtration. Remember to check your water quality report and choose a filter designed for your specific needs.
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