Hayward Universal HC Series NG/LP Dual-Fuel Low NOx Heater 275K BTU
The Hayward Universal HC Series NG/LP Dual-Fuel Low NOx Heater 275K BTU is uniquely engineered for use with Hayward® plumbing adapters, making it an easy drop-in replacement for other heater brands. The cupro nickel heat exchanger adds reliability, and an easy-out air/gas mixing orifice makes propane conversion fast and simple — no need to choose a single fuel type at purchase.
Featuring the industry's smallest footprint with zero wall clearance, the HDF275 fits even the most compact equipment pads. Refined gas controls and remote connectivity provide a simple user experience with added service convenience. Backed by an industry-leading 5-year parts and 2-year labor warranty.
⚠️ Professional Installation Required. Pool heater installation involves gas line connections and electrical wiring. Always use a licensed contractor to ensure safety, code compliance, and warranty validity.
Key Features
Dual-Fuel: Natural Gas and Propane
Works with both NG and LP — switch fuels with an easy-out air/gas mixing orifice. No need to buy two different heaters.
275,000 BTU Output
Mid-range capacity for in-ground pools and spas.
Drop-In Replacement for Any Brand
Uniquely engineered for Hayward plumbing adapters — easy replacement for competitors' heaters.
Industry's Smallest Footprint
Zero wall clearance required — fits in the most compact equipment pads.
Cupro Nickel Heat Exchanger
Added reliability and corrosion resistance for salt water and chemical-heavy pools.
Remote Connectivity
Remote monitoring and control for convenient operation and service access.
Refined Gas Controls
Simple user experience with streamlined controls designed for ease of use.
Low NOx
Low NOx certified — meets clean air quality emission standards.
5-Year Parts / 2-Year Labor Warranty
One of the best warranties in the residential pool heater category.
Who It's For
- In-ground pool owners who want the flexibility of dual-fuel operation (NG or LP)
- Anyone replacing an existing heater who wants drop-in compatibility with any brand's plumbing
- Equipment pad installations where space is extremely limited — zero wall clearance
- Pool owners who want a 5-year parts warranty and remote connectivity
Specifications
Heating Performance
| BTU Output | 275,000 BTU |
| Fuel Type | Natural Gas / Liquid Propane (Dual-Fuel) |
| Emissions | Low NOx |
Construction
| Heat Exchanger | Cupro Nickel |
| LP Conversion | Easy-Out Air/Gas Mixing Orifice |
| Remote Connectivity | Yes |
| Wall Clearance Required | Zero |
Physical
| Product Weight | 174 lb |
| Shipping Dimensions | 33.3 × 32.8 × 35.3 in |
Approvals & Warranty
| Application | In-Ground Pool |
| Warranty | 5 Years Parts / 2 Years Labor |
What's in the Box
- Hayward Universal HC Series Dual-Fuel 275K BTU Heater
- Air/Gas Mixing Orifice (for LP conversion)
- User Manual
Warranty
The Hayward HC Series HDF275 comes with a 5-year parts and 2-year labor manufacturer warranty. Clearflow Pool Supply is an authorized Hayward dealer and will assist with any warranty service needed.
Frequently Asked Questions
How does the dual-fuel switching work?
The HDF275 ships ready for natural gas. To convert to liquid propane, remove the easy-out air/gas mixing orifice and install the LP orifice. The process is designed to be quick and straightforward — no special tools required. Your licensed installer can perform the conversion at installation time or later if your fuel source changes.
Is it truly a drop-in replacement for other brands?
Yes. The HC Series is engineered to work with Hayward plumbing adapters that match the connection points of other popular heater brands, making it possible to swap out a competitor's heater without major replumbing. Your licensed installer can confirm compatibility with your existing pad layout.
What does zero wall clearance mean?
Zero wall clearance means the heater can be installed directly against a wall or fence without any required separation distance. This is a significant advantage for equipment pads where space is tight — most heaters require 12–24 inches of clearance on all sides.
Does this heater require professional installation?
Yes. Gas heater installation involves connecting to a natural gas or propane supply line, electrical wiring, and proper venting. A licensed pool contractor or plumber must perform the installation to ensure safety, local code compliance, and warranty validity.
What size pool is the 275K BTU suitable for?
As a general guideline, 275,000 BTU is typically suited for pools in the 20,000–30,000 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.