Residential Air-to-Water Heat Pumps - Withair® Heating and Cooling, Air Conditioning, Heat Pump, Chiller, Industrial Process Cooling & Heating Systems, and Indoor Air Quality

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Residential Air-to-Water Heat Pump Water Heaters

Applied range: household sanitary hot water, maximum water Temp. 65℃
Special compressor: specially designed for heat pump water heater
Unit runs or stop automatically according to water temperature
Connectivity, flexibility and serviceability enabled by smart controller
Electric expansion valve regulates the flow of refrigerant precisely
Air exchanger(Fins-coil) with hydrophilic coating
Intelligently & automatically judge the frosting degree & accurately defrost
Modbus RS485, BACnet communication interface
Automatic prevent freezing in the winter
Water exchanger: tube in tube heat exchanger, Internal spiral design, high thermal efficiency and effective to prevent scaling

Overview

Wide Range of Applications

Not only do Withair® heat pumps offer economical heating of residential and commercial settings, they can also provide a total solution for domestic heating and hot water supply. Connecting solar collectors to the heat pump system further increases efficiency and savings.
Energy Efficiency

Withair® advanced heat pump and inverter technologies deliver optimum energy efficiency.
Quiet Operations

Unique designs, including inverter-driven compressors and natural convection heat distribution, ensure quiet operation of Withair® indoor and outdoor units.
Integrated Heating and Hot Water

Installation space and costs are greatly reduced with one integrated system for heating and hot water supply.
Maximize System Performance by Deluxe Controls

The smart electronic controls are unique to Withair’s equipment. Designed for enhanced component protection and optimal system performance, the microprocessor board is factory-wired and ready for field installation. Optional advanced connectivity kit including connectivity to any BMS on Site.

Control features include: Reversing valve coil; Compressor protection; Compressor delay on start; Random start delay; Anti-short cycle timer; Brown-out protection; Low pressure time delay; Low and high pressure switches.

Models

co Heat Pump Specifications	WFRS-3.6E1(W)	WFRS-4.6E1(W)	WFRS-6.8E1W	WFRS-11E1	WFRS-18E1	WFRS-20E2
Heating Capacity (kW)	3.6	4.6	6.8	11.0	18.0	20.0
Hot Water Output (L/h)	77	98	145	235	386	428
Hot Water Up To (℃)	65	65	65	65	65	65
Compressor	Hermetic Rotary	Hermetic Rotary	Hermetic Rotary	Hermetic Rotary	Hermetic Scroll	Hermetic Scroll
Voltage	208, 230	208, 230	208, 230	208, 230	208, 230	208, 380
Frequency	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60	50 and 60
Refrigerant	R410A	R410A	R410A	R410A	R410A	R410A
EVI Version	Option	Option	Option	Option	Option	Option
Modbus RS485, BACnet communication interface	Option	Option	Option	Option	Option	Option

co Water Tank Specifications	SX150	SX200	SX300	SX400	SX500
Volume (L)	150	200	300	400	500
Cold/Hot Water Pipe Size	G1/2″	G1/2″	G3/4″	G3/4″	G1″
Circulating Inlet/Outlet Size	G3/4″	G3/4″	G3/4″	G3/4″	G1″
Drain Pipe Size	High Efficiency	High Efficiency	High Efficiency	High Efficiency	High Efficiency
Inner Tank Material	Stainless steel 304	Stainless steel 304	Stainless steel 304	Stainless steel 304	Stainless steel 304
Outer Tank Material	Painted Galvanized Steel	Painted Galvanized Steel	Painted Galvanized Steel	Painted Galvanized Steel	Painted Galvanized Steel
Insulation Layer	High Density Polyurethane	High Density Polyurethane	High Density Polyurethane	High Density Polyurethane	High Density Polyurethane
Heating Coils	Option	Option	Option	Option	Option
Optional Accessories	Electric Heater Airvent Valve Safe Valve Pressure Gage Make-up Valve	Electric Heater Airvent Valve Safe Valve Pressure Gage Make-up Valve	Electric Heater Airvent Valve Safe Valve Pressure Gage Make-up Valve	Electric Heater Airvent Valve Safe Valve Pressure Gage Make-up Valve	Electric Heater Airvent Valve Safe Valve Pressure Gage Make-up Valve

Factory Installed Options

Unit Options

Controls Options

Electrical Options

Resources

Name	Size	Download
Withair® Water-Cooled-Chillers-Line-Card.pdf	606KB	Download
Withair® Air-Side-Products-Line-Card.pdf	270KB	Download
Withair® Ground(Water)-Source-Heat Pumps-Line-Card.pdf	786KB	Download
Withair® Air-Cooled-Heat Pumps-Line-Card.pdf	1.03MB	Download
Withair® Air-Cooled-Chillers-Line-Card.pdf	929KB	Download