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Integrating an air-to-water heat pump within a boiler hydronic heating system

ECO^™ Hybrid Dual Fuel Hydronic System

The New ECO™ Hybrid is a dual-fuel hydronic system that integrates our ECO HP air-to-water heat pump with a high-efficiency boiler, providing optimal heating performance. It automatically switches between the heat pump and boiler based on outdoor temperatures to maximize energy efficiency and comfort. Ideal for retrofits and new installations, the ECO HP helps homeowners reduce their carbon footprint and may reduce energy costs while maintaining reliable heat.

Features

Highly Efficient

Achieves efficiencies up to 5.37 COP for optimal savings

Eco-friendly Refrigerant

Heat pump uses R32 refrigerant for improved sustainability

Flexible Applications

Use for radiant heating and domestic hot water

Installation Ready

Easy-Up manifold included and accessory kit available

Optimal Design

Low decibel, quiet operation plus compact design

Cost Savings

Minimal maintenance, rebates and tax credits available in some areas

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See it in action

Technical Specs

Model	Nominal Capacity* (MBH)	COP @ Nominal	Input @ Nominal (kW)	Max Capacity (MBH)	Max Input (kW)	Min Capacity (MBH)	Min Input (kW)	Outdoor Temp (Deg °F)	Heating Supply Temp (Deg °F)
ECOHP-41	41.2	4.95	2.44	51.1	3.19	21.1	1.21	-13 – 109	77 – 149
ECOHP-48	49.5	4.7	3.09	56.0	3.66	21.1	1.21	-13 – 109	77 – 149
ECOHP-55	54.6	4.5	3.56	59.3	3.93	21.1	1.21	-13 – 109	77 – 149

Flow

3.1 – 13.2 GPM

Pressure Drop @ 12.1 GPM

9 FT

Piping Connections

1 Inch

Type

R-32

Factory Charge

4.04 LBS

Max Pre-Charged Pipe Length

49.2 FT

Additional Charge

0.41 OZ/FT

Liquid Line Connection

3/8 IN

Gas Line Connection

5/8 In

Compressor Type

Twin Rotary

ODU Power

208–230/1/6 V/Ph/Hz

Compressor RLA

26 A

ODU Fan FLA

1.3 A

ODU MCA

34 A

ODU MOP

50 A

IDU Power

110-120/1/60 V/Ph/Hz

IDU MCA

1.5 A

IDU MOP

15 A

IDU Net

69 LBS

IDU Shipping

78 LBS

ODU Net

212 LBS

ODU Shipping

255 LBS

Downloads

Product Manuals

ECO HP IDU Manual ECO HP ODU Manual

Sales Collateral

ECO HP Case Study: Hybrid Hydronic Heat + DHW for Residential Homes ECO HP Brochure

In the news

News | Featured Article
ECO™ Hybrid System Named #1 Product of the Year by Plumbing & Mechanical
The ECO™ Hybrid System from Weil‑McLain has been recognized as the #1 Product of the Year for 2025 by Plumbing & Mechanical magazine. This top ranking reflects strong industry interest…
Featured Article
Hybrid Hydronic Heat + DHW for Residential Homes
Hybrid system combines electric heat pump with high-efficiency boiler for radiant heating, snow melt, and hot water—maximizing efficiency while ensuring reliability in extreme cold.
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Heat Pump Combines Efficiency with Reliability
Retrofit Magazine profiles the ECO HP, focusing on how the system blends high energy efficiency with proven reliability for renovation and retrofit projects.
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Weil-McLain introduces ECO HP Air-to-Water Heat Pump for hybrid hydronic heating
Indoor Comfort Marketing covers the launch of the ECO HP, emphasizing its role in offering contractors and homeowners a reliable, energy-smart heating option.
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ECO HP AIR-TO-WATER ELECTRIC HEAT PUMP
An overview of the ECO HP’s electric heat pump capabilities, promoting its advantages in decarbonizing and modernizing home heating systems.
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Weil-McLain: ECO HP Air-to-Water Heat Pump
FacilitiesNet highlights the key features of the ECO HP, noting its ability to improve energy efficiency and heating reliability where it’s needed.
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Weil-McLain introduces ECO HP Air-to-Water Heat Pump for hybrid dual-fuel hydronic heating
Announcement of the ECO HP system, underlining its high-efficiency performance and flexible integration into existing boiler-based hydronic systems.
News Article
Weil-McLain launches dual-fuel heat pumps for residential, light commercial applications
A news story detailing Weil-McLain’s ECO HP launch, focusing on its dual-fuel capabilities and the system’s relevance for renewable energy markets.
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Weil-McLain Introduces Air-to-Water Heat Pump for Hybrid Dual-Fuel Hydronic Heating
Coverage of the new ECO HP air-to-water heat pump introduction, emphasizing Weil-McLain’s commitment to efficient, modern heating technologies.
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Weil-McLain air-to-water heat pump
A news announcement highlighting the launch of Weil-McLain’s ECO HP, designed to meet the growing demand for sustainable hydronic heating solutions.
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Overview Video: Weil-McLain ECO Hybrid Dual Fuel Hydronic System Overview
An article featuring Weil-McLain’s new ECO Hybrid overview video, showcasing the system’s innovative dual-fuel design and energy-saving benefits.
News Article
Weil-McLain ECO HP Air-to-Water Heat Pump
An announcement covering the key features of the new ECO HP, including high-efficiency operation, dual-fuel capabilities, and easy integration with existing boiler systems.
News Article
Weil-McLain® Introduces ECO™ HP Air-to-Water Heat Pump for Hybrid Dual-Fuel Hydronic Heating
A news post announcing the launch of the ECO HP air-to-water heat pump, detailing its application for sustainable hydronic heating in homes and small businesses.
News Article
Residential Heating Showcase
Weil-McLain’s ECO Hybrid system is featured in ACHR News’ Residential Heating Showcase, spotlighting its energy-efficient performance and compatibility with both new construction and retrofits.
News Article
Weil-McLain air-to-water heat pump
News coverage introducing Weil-McLain’s ECO Hybrid system, emphasizing its role in delivering efficient, dual-fuel heating solutions for residential and light commercial applications.