The W3HP31005T is a round-platform heat pump that both heats and cools above-ground and in-ground pools. It runs quietly, performs in low ambient temperatures down to 40°F, and uses a titanium heat exchanger built to handle demanding pool environments. The compact round cabinet fits new and existing installations and makes servicing straightforward.

W3HP31005T Specs & Features

The W3HP31005T produces 100,000 BTU/hr (29 kW) and operates on 220/240V single-phase, 60 Hz power with a 70-amp maximum breaker. It handles water flow between 30 and 75 GPM, connects via 2" × 2½" union fittings, and installs in a round cabinet measuring 40" H × 31.5" W × 31.5" L.

W3HP31005T Electrical & Installation Requirements

Before installing, confirm your electrical service supports a dedicated 70-amp breaker on 220/240V single-phase power. Required clearances are 6 inches on the rear, 6 inches on each side, and 72 inches vertical — these apply to new pad installs and retrofits alike. The 2" × 2½" union plumbing connections make future service much easier than sweat-fit alternatives.

HeatPro Heat Pump Performance Details

The W3HP31005T pairs a single-speed compressor with a multi-speed ECM fan motor. The ECM fan adjusts speed based on demand, reducing noise during lower-load operation and improving efficiency. Active defrost keeps the unit running when temperatures drop, and low ambient operation extends the usable season to conditions where standard heat pumps would shut down.

Titanium Heat Exchanger & Coastal Durability

The titanium heat exchanger resists corrosion far better than copper or cupronickel alternatives — which matters most in pools with aggressive chemistry or salt systems. For coastal installs, the Ultra Gold corrosion-resistant evaporator fin adds another layer of protection against salt air. That combination gives the W3HP31005T a meaningful durability advantage over standard-fin competitors near the ocean.

How the HeatPro 100,000 BTU Heat Pump Compares to Gas Heaters

Unlike gas heaters, the W3HP31005T moves heat from the air rather than burning fuel, which makes it significantly more efficient in moderate climates. It also cools the pool — something gas heaters can't do. The tradeoff is cold-weather performance: gas heaters maintain full output at any temperature, while this unit's efficiency drops below its 40°F minimum. For most pool seasons in mild to moderate climates, a heat pump like this delivers lower operating costs. For year-round pools in cold climates, pairing it with a gas backup is worth considering.

**Full Specifications — W3HP31005T**
Specification	Value
Brand	Hayward
Model / SKU	W3HP31005T
Series	HeatPro
Platform	Round
Pool Type	Above Ground & In Ground
Heating Capacity	100,000 BTU/hr
Kilowatts	29 kW
Cooling Capability	Yes
Active Defrost	Yes
Low Ambient Operation	Yes
Minimum Operating Temperature	40°F
Compressor Speed	Single-speed
Fan Motor Type	Multi-speed ECM
Heat Exchanger	Titanium
Evaporator Coil	Ultra Gold corrosion-resistant
Boost Mode	No
Silent Mode	No
Voltage	220/240V
Phase	Single
Frequency	60 Hz
Maximum Breaker Size	70 Amps
Water Flow Rate	30–75 GPM
Plumbing Connections	2" × 2½" union
Rear Clearance	6"
Side Clearance	6"
Vertical Clearance	72"
Product Dimensions (H × W × L)	40" × 31.5" × 31.5"
Product Weight	247 lb
Shipping Dimensions	43" × 33.8" × 33.5"
Shipping Weight	296 lb
Refrigerant	Yes
Channel	Open Line
GTIN	610377442343

Frequently Asked Questions

Does this model heat and cool the pool?

Yes. The W3HP31005T includes both heating and cooling capability, active defrost, and low ambient operation — which extends its useful season into cooler weather that would shut down a standard heat pump.

What types of pools can this unit work with?

It's compatible with both above-ground and in-ground pools. Before purchasing, confirm your pool's volume, plumbing layout, and available electrical service match the unit's requirements.

Why does the titanium heat exchanger matter?

Titanium handles aggressive pool chemistry — including salt and high sanitizer levels — without corroding the way copper or cupronickel do. It's a durability upgrade that pays off over the life of the unit, especially in pools with saltwater systems.

Is this a good choice for a coastal installation?

Yes. The Ultra Gold corrosion-resistant evaporator fin is specifically built to hold up in salt air environments. Combined with the titanium heat exchanger, the W3HP31005T is one of the better-equipped models in its class for coastal use.

What electrical and clearance requirements should I know before installing?

The unit requires a dedicated 220/240V single-phase circuit with a 70-amp maximum breaker. Installation clearances are 6" rear, 6" sides, and 72" vertical. Review the installation manual before roughing in electrical or setting the pad — these measurements affect where the unit can go.

W3HP31005T Warranty & Manuals

The W3HP31005T includes a 1-year parts warranty with no labor coverage. Review the installation manual before any work begins to confirm electrical service, water flow, and clearance requirements are met at the site.

W3HP31005T Installation Manual

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