Pool and Spa Heater

Hello! Today I'll be sharing my thoughts on the Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater, Natural Gas, Low Nox. As an avid pool owner, I recently had to replace my old pool heater and decided to give this model a try. Let me walk you through the pros and cons of this product.

Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater

Pros and Cons

What We Liked

  1. Superior value and reliability: The cupro nickel heat exchanger ensures excellent performance and longevity.
  2. Hydraulic efficiency: The patented polymer header and bypass valve design maximize hydraulic efficiency, resulting in energy savings.
  3. Easy installation: The Hayward Universal design makes installation a breeze, even for professionals. The versatile design allows for seamless integration into any pool setup.
  4. Low NOx emissions: This heater meets or exceeds air quality emission standards, making it environmentally responsible.
  5. Cost-effective: Compared to purchasing from local pool companies, buying this heater online saved me almost $900 while still providing a bigger capacity.

What Can Be Improved

  1. Sensitivity to water supply: Occasionally, the heater shuts off with an error code for insufficient water supply. However, a simple backwashing quickly resolves the issue.
  2. Confusion in the instruction manual: The section on remote thermostat led me to believe I needed one, but the unit actually has an internal thermostat. Clearer instructions would be helpful.

Quick Verdict

The Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater is a reliable and efficient choice for pool owners. It offers superior value, easy installation, and low emissions. Despite some minor issues with water supply sensitivity and confusing instructions, this pool heater delivers excellent performance. Overall, I highly recommend this product for its quality, cost-effectiveness, and ease of use. If you're in the market for a new pool heater, give this one a try!

Click here to check out the Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater on Amazon.

Unboxing - What's Inside?

I recently purchased the Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater from Amazon. Living in the USA, I was in dire need of a reliable and efficient pool heater, and this model caught my eye. I ordered it through Amazon and was pleased with how quickly it was delivered to my doorstep. Within just a few days, I had the heater in my possession.

When I unboxed the Hayward H250FDN, I was pleasantly surprised by the contents. The box contained the main unit of the heater, which appeared to be well-packaged and protected. Additionally, there were some accessories like connectors and pipes included, which were a welcome addition. Overall, the unboxing experience was hassle-free and everything was neatly organized.


The Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater is a top-rated product in the category. Here are some key specifications:

  • Brand: Hayward
  • Manufacturer: Hayward
  • Item Weight: 165 pounds
  • Product Dimensions: 29 x 28 x 24 inches

These specifications indicate that the heater is manufactured by Hayward and weighs 165 pounds. It has dimensions of 29 x 28 x 24 inches, making it suitable for most pool and spa setups. The weight and dimensions of the product ensure its stability and durability.

User Guide

The documentation that came with the Hayward H250FDN proved to be incredibly helpful. It provided clear and concise instructions on how to install and operate the heater. The user guide contained diagrams and step-by-step explanations, making the setup process a breeze. Additionally, it also included maintenance tips and troubleshooting advice, ensuring that I had all the necessary information to keep the heater running smoothly.

If you're interested in checking out the user guide yourself, you can find it here.

Features - What We Found

Cupro Nickel Heat Exchanger for Superior Value and Reliability

The Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater features a standard Cupro nickel heat exchanger that provides superior value and reliability. Cupro nickel is highly resistant to corrosion and erosion, ensuring the longevity of the heat exchanger. This means you can enjoy a consistently warm pool or spa without worrying about deterioration or damage to the heating system.

With its exceptional durability, the Cupro nickel heat exchanger also offers better heat transfer compared to other materials. This results in faster heating times and more efficient operation, saving you energy and reducing operating costs. Additionally, the Cupro nickel construction is compatible with various water chemistry and can handle high flow rates, making it suitable for use in different pool and spa systems.

Pro-tip: Regularly clean and maintain the Cupro nickel heat exchanger to ensure optimal performance and extend its lifespan. A yearly professional inspection is recommended to identify any potential issues early on.

Patented Polymer Header and Bypass Valve Design for Hydraulic Efficiency and Reliability

The Hayward H250FDN features a patented polymer header and bypass valve design, which ensures the ultimate in hydraulic efficiency and reliability. The polymer header is designed to minimize hydraulic resistance, allowing for smoother water flow and reducing strain on the system. This results in improved overall efficiency and lower operating costs.

In addition to hydraulic efficiency, the polymer header and bypass valve also contribute to the reliability of the heater. The polymer material used in the design is highly resistant to corrosion and chemical damage, ensuring long-term durability. The bypass valve helps regulate water flow and pressure, preventing potential damage to the system due to excessive pressure or flow.

Contextual product_link: You can find more information about the Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater here.

Easy and Versatile Professional Installation

The Hayward H250FDN is designed with a Universal design, making it easy and versatile for professional installation. The universal design allows compatibility with various plumbing configurations, simplifying the installation process and reducing the need for additional adaptors or modifications.

Whether you have an above-ground or in-ground pool or spa, the Hayward H250FDN can be easily installed by a professional to suit your specific setup. The versatility of the heater's design ensures seamless integration into your existing plumbing system, minimizing installation time and potential complications.

Low NOx Emissions for Environmentally Responsible Operation

The Hayward H250FDN Pool and Spa Heater is engineered with low NOx emissions technology, ensuring environmentally responsible operation. The heater meets or exceeds air quality emission standards in all Low NOx regions, making it compliant with strict environmental regulations.

By reducing nitrogen oxide (NOx) emissions, the Hayward H250FDN minimizes its impact on air quality and promotes a cleaner and healthier environment. This feature is especially important for areas with stringent emission regulations, as it allows you to enjoy a warm pool or spa while prioritizing environmental conservation.

Superior Value and Reliability

Overall, the Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater offers exceptional value and reliability. With its Cupro nickel heat exchanger, patented polymer header and bypass valve design, easy installation, low NOx emissions, and durable construction, this heater provides long-term performance and energy efficiency for your pool or spa.

Pro-tip: Regular maintenance, including occasional cleaning, inspection, and proper water chemistry maintenance, will maximize the lifespan and efficiency of the Hayward H250FDN heater, ensuring continued superior value and reliability.

Our Review and Score

Our Score: 71.0

I recently purchased the Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater and I have been extremely satisfied with my purchase. As a major online purchase, I was initially hesitant, but after reading reviews and comparing prices, I decided to give it a try. The installation was easy thanks to the Hayward Universal design, and the heater has been working flawlessly.

One of the standout features of this heater is the standard Cupro nickel heat exchanger, which ensures superior value and reliability. I have peace of mind knowing that this heater is designed for hydraulic efficiency and reliability with its patented polymer header and bypass valve design. Additionally, the environmentally responsible low NOx emissions of this heater meet or exceed air quality emission standards.

I highly recommend this Hayward pool and spa heater for anyone in need of a reliable and efficient solution. You can find more information about the product and make a purchase here.

Alternatives To Consider

When it comes to pool and spa heaters, the Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater is undoubtedly a popular choice. However, if you're looking for alternative options, there are a few compelling reasons why you should consider these alternate products:

  1. Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater - This heater offers efficient and reliable performance, ensuring that your pool or spa stays at the perfect temperature. It operates using natural gas and features Low Nox emissions, making it environmentally friendly. With its versatile design, it can be used for both pools and spas. However, if you're looking for other options, keep reading.
  2. Hayward W3HP21404T HeatPro 140,000 BTU Pool Heat Pump - If you prefer an alternative to a gas heater, this heat pump is an excellent choice. It operates by capturing heat from the surrounding air and transferring it to your pool or spa. With its 140,000 BTU capacity, it is suitable for in-ground pools. The heat pump is energy-efficient and cost-effective, providing a reliable heating solution for your pool.
  3. Hayward IDXL2DB1930 Display Board Replacement - Instead of replacing the entire heater, you might consider this display board replacement for your Hayward Universal H-Series Low Nox Induced Draft Heater. It offers a cost-effective solution if your display board is malfunctioning, allowing you to continue using your existing heater with ease.
  4. Raypak 336,000 BTU Digital Electronic Ignition Propane Pool Heater - If you prefer a propane-powered heater, this Raypak model is worth considering. With its digital electronic ignition, it provides reliable and quick heating for your pool. The 336,000 BTU capacity ensures that even larger pools can be heated efficiently.
  5. Hayward FDXLIGN1930 FD Ignitor Replacement Kit - If you are experiencing ignition issues with your Hayward Universal H-Series Low Nox Pool Heater, this ignitor replacement kit is a cost-effective solution. It allows you to replace the faulty ignitor, ensuring that your heater continues to function optimally.

These alternatives offer a range of choices to suit different preferences and needs. Whether you prefer a heat pump, a propane heater, or require replacement parts for your existing heater, these products provide reliable options. Consider the specific requirements of your pool or spa, as well as your budget and preferences, to make the best choice for your heating needs.

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