Hayward Universal H-Series Natural Gas Heater 250K BTU 110/220V
The Hayward Universal H-Series Natural Gas Heater 250K BTU 110/220V is an energy efficient, high performance, installation-adaptable commitment to the pool service professional. Designed for pool and spa applications with a standard cupro nickel heat exchanger for excellent salt water and chemical corrosion resistance.
Built by Hayward with a patented header bypass design, exclusive "Totally Managed" cupro nickel heat exchanger water flow for same water velocity through all tubes, up to 18% pump run-time savings, Low NOx emissions, and 2 in × 2.5 in CPVC union plumbing connections. 83% thermal efficiency. Requires professional installation.
⚠️ Professional Installation Required. Pool heater installation involves gas line connections and electrical wiring. Always use a licensed contractor for installation to ensure safety, code compliance, and warranty validity.
Key Features
250,000 BTU Output
High-capacity heating for pools and spas.
Cupro Nickel Heat Exchanger
Excellent resistance to salt water and chemical corrosion — built to last.
"Totally Managed" Water Flow
Same water velocity through all tubes for faster, more uniform heating.
Patented Header Bypass Design
Up to 18% savings by reducing pump run-time.
83% Thermal Efficiency
Energy-efficient operation — green certified.
Low NOx Emissions
Meets clean air quality standards.
Digital Electric Dual Thermostat
Precise temperature control for pool and spa.
Installation Adaptable
2 in × 2.5 in CPVC union plumbing connections with common union for installation or service. Adapts to larger plumbing for greater efficiencies.
Who It's For
- Pool and spa owners wanting a proven, corrosion-resistant natural gas heater
- Salt water pool owners who need a cupro nickel heat exchanger for long-term durability
- Pool service professionals installing a commercial or residential gas heater
- Anyone replacing an existing H-Series heater with the same proven platform
Specifications
Heating Performance
| BTU Output | 250,000 BTU |
| Thermal Efficiency | 83% |
| Fuel Type | Natural Gas |
| Emissions | Low NOx |
Construction
| Heat Exchanger | Cupro Nickel |
| Header Material | Polymer |
| Control Type | Digital Electric, Dual Thermostat |
Installation
| Plumbing Connections | 2 in × 2.5 in CPVC Union |
| Gas Connection | 0.75 in |
| Indoor Vent Pipe Diameter | 4 in |
| Voltage | 110V / 220V |
| Frequency | 60 Hz |
| Phase | Single |
Physical
| Product Weight | 171.3 lb |
| Cabinet Height | 24 in |
| Cabinet Width | 28 in |
| Shipping Dimensions | 33 × 32.5 × 30 in |
Approvals & Warranty
| Application | Pool / Spa |
| Energy Efficient | Yes (Green Certified) |
| Warranty | 1 Year |
What's in the Box
- Hayward Universal H-Series 250K BTU Natural Gas Heater
- CPVC Union Fittings
- User Manual
Warranty
The Hayward Universal H-Series comes with a 1-year manufacturer warranty. Clearflow Pool Supply is an authorized Hayward dealer and will assist with any warranty service needed.
Downloads
Frequently Asked Questions
Does the Universal H-Series require a professional for installation?
Yes. Gas heater installation involves connecting to a natural gas line and electrical supply, along with proper venting. A licensed pool or HVAC contractor must perform the installation to ensure safety, local code compliance, and warranty validity.
Why is a cupro nickel heat exchanger important?
Cupro nickel is significantly more resistant to corrosion from salt water and pool chemicals than standard copper heat exchangers. For salt water pools or pools with higher chemical demands, a cupro nickel heat exchanger provides longer service life and lower long-term maintenance costs.
What does the patented header bypass design do?
The patented bypass design allows the heater to operate at lower flow rates without triggering a low-flow shutdown — which means the pump doesn't need to run as long or as hard to heat the pool, resulting in up to 18% savings in pump run-time and energy costs.
Is this heater compatible with salt water pools?
Yes. The cupro nickel heat exchanger provides excellent resistance to salt water corrosion, making the Universal H-Series a reliable choice for salt water pool installations.
What size pool is the 250K BTU suitable for?
As a general guideline, a 250,000 BTU heater is typically suited for pools in the 15,000-30,000 gallon range depending on climate, desired temperature rise, and heat loss factors. A licensed pool professional can calculate the correct BTU requirement for your specific pool and location.