Raypak TWPH-4550EHT08 Crosswind V 4550 Pool & Spa Heat Pump, Heat-Only, 85,000 BTU, 5.8 COP, 208-230V, Rheem TWPH-4550EHT10

The Crosswind V 4550 is the smallest size in Raypak's Crosswind V line of vertical-discharge heat pumps. It takes heat from the outside air and moves it into the pool water through a titanium tube heat exchanger. Its control connects to Wi-Fi for the Raymote phone app.

Made for: Residential pools and spas on 2 in. plumbing. Outdoor installation only. Raypak does not certify the Crosswind V for indoor use; it cannot go in a shed or garage or under a deck or porch. Raypak's minimum recommended water flow is 20 GPM. Above 40 GPM the 4550 needs an external bypass; Raypak's bypass assembly kit 100-10000816 is sold separately for Standard models. Pool cooling (Cool Mode) is on Raypak's Deluxe heat/cool models, TWPH-6550EHC08 and TWPH-8550EHC08.

• Water connections: PVC unions, reached through the front panel. Two union halves come with the heater.
• Control: digital display with pool, spa and timed spa modes. Pool setpoint limit adjustable up to 95 degrees F, spa up to 104 degrees F.
• Built-in automation: outputs for two valve actuators, a single-speed or variable-speed pump and auxiliary on/off equipment such as lights or water features. The control can also call a gas or electric heater as auxiliary heat.
• Cabinet: powder-coated metal, about 33.8 in. wide x 33.8 in. deep x 37.8 in. high, with a four-blade fan that discharges upward. Shipping carton 38.75 x 38.75 x 42.5 in.
• In the carton: four hurricane tie-down brackets with 16 screws, two union halves, the optional control harnesses, the manual and the warranty.
• Raypak limited warranty: 2 years labor, 7 years parts and 10 years on the titanium tube of the heat exchanger, when installed by a licensed service provider.
• UPC 662021604584.

Good to know: A heat pump puts out less heat per hour than a gas heater and may run many hours a day to hold temperature. Raypak recommends covering the pool when it is not in use. Leave 5 ft of open space above the unit and 1 ft on each side for service, and keep it at least 3 ft from any gas or other fuel-burning heater. Chlorinators and chemical feeders go after the heater, with a check valve or Hartford loop between them. If the heater sits below the pool water line, the water pressure switch may need adjusting, and Raypak's manual calls for an external water flow switch (kit H000166, not included). Electrical connection is for a licensed electrician, and any work on the sealed refrigerant circuit is for a qualified technician.