Product Overview

The Hayward HeatPro MCHX 110K BTU Pool Heat Pump | W3HP21105T delivers efficient, dependable electric heating for inground swimming pools while helping reduce operating costs compared with traditional fuel-fired heating.

Designed with Hayward’s advanced Microchannel Heat Exchanger (MCHX) technology, this heat-only model provides up to 110,000 BTU/hr of heating capacity in a compact, durable platform. The microchannel coil incorporates a corrosion-resistant TCP coating, a more robust coil structure, fewer brazed joints, and a reduced refrigerant charge for dependable outdoor performance.

With low-ambient operation, a 40-amp electrical requirement, and compatibility with Hayward Omni automation, the HeatPro MCHX is an excellent option for pool owners looking to extend their swimming season with efficient electric heat.

Key Features

110,000 BTU Heating Capacity: Provides powerful heat-only performance for residential inground swimming pools.

Advanced Microchannel Technology: Hayward’s MCHX design improves heat-transfer efficiency while reducing coil weight, refrigerant requirements, and system complexity.

Enhanced Corrosion Resistance: The microchannel coil features a Trivalent Chromium Process (TCP) coating designed to provide strong protection in demanding outdoor environments.

Reduced Leak Opportunities: Microchannel construction reduces the number of brazed joints by approximately 85% compared with conventional coil designs.

Low-Ambient Heating Capability: Designed for operation in ambient temperatures down to approximately 40°F, allowing homeowners to extend their swimming season into cooler weather.

Omni Automation Compatibility: Can be integrated with compatible Hayward Omni automation for convenient temperature control and scheduling.

Benefits

Energy-efficient alternative to conventional gas heating

Extends the usable swimming season

Heat-only design for customers who do not require pool cooling

Compact square-platform construction

Corrosion-resistant outdoor coil

Reduced refrigerant charge

Single-speed compressor

Suitable for new construction and pool renovations

Designed specifically for inground pools

Specifications

Warranty & Compatibility

Installation Information

Professional installation by a qualified pool equipment and electrical professional is strongly recommended.

The HeatPro requires a dedicated 220/240V single-phase electrical supply and proper water flow through the pool circulation system. Installation location must also provide adequate airflow and manufacturer-required clearances.

Heat pump performance depends heavily on ambient air temperature, pool size, desired water temperature, wind exposure, geographic location, and whether a pool cover is used.

Confirm Before Ordering

Before purchasing, confirm:

• Your pool size and required heating capacity
• Available 220/240V electrical service
• 40-amp circuit requirements
• Available installation clearances
• Water flow of approximately 30–75 GPM
• That you need heating only and not Heat+Chill functionality

This model does not cool or chill pool water.

Warranty Information

The W3HP21105T is an Open Line model. Hayward currently specifies:

1-Year Parts Warranty
No Labor Warranty

Warranty eligibility, registration requirements, exclusions, and coverage are subject to Hayward's current warranty terms. Do not confuse this model with the Expert Line HP21105T, which carries different warranty coverage.

Customer-Facing Q&A

Q: Does the W3HP21105T heat and cool the pool?
A: No. This is a dedicated heat-only model.

Q: How much heating capacity does it provide?
A: It is rated for up to 110,000 BTU/hr of heating output.

Q: Can it operate in cooler weather?
A: Yes. Hayward lists low-ambient operation with a minimum operating temperature of approximately 40°F. Actual heating output decreases as outdoor air temperature drops.

Q: Can I control it with Hayward automation?
A: Yes. The HeatPro MCHX Series can be paired with compatible Hayward Omni automation for additional temperature control and scheduling capabilities.

Q: What size pool will it heat?
A: Heat pump sizing should not be based on gallons alone. Climate, desired temperature rise, pool surface area, wind exposure, shade, and use of a pool cover can significantly affect the required capacity.

Q: Does it require professional installation?
A: Professional installation is recommended because the unit requires high-voltage electrical service, correct plumbing flow, proper clearances, and code-compliant installation.