SpacePak Hydronics

  • Conserving Energy and Environmental Integrity
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Hydronic Heating and Cooling

In addition to Small Duct High Velocity systems, SpacePak also offers a full line of high-efficiency hydronic solutions. Unlike forced air systems that exclusively use fossil fuels and refrigerants, hydronic systems use water as the medium for heating and cooling.

Most hydronic systems that feature a water-to-water heat pump are limited to heating-only. SpacePak’s Solstice series are true air-to-water reverse cycle heat pumps that can alternate between heating and cooling, providing your family with an all-in-one home comfort solution.

Living room with grey couch and coffee table with a Hydronic High Wall unit
  • What Are Heat Pumps
  • Hydronic Benefits
  • Flexible Solutions

Hydronic Heating & Cooling

Hydronic technology has long been known for providing unsurpassed heating comfort. New innovative technologies have allowed hydronic equipment manufacturers the opportunity to provide complete packaged solutions for both space heating and central cooling using the known advantages of hydronics over that of traditional forced air systems. Using the same physical properties that make water ideal for conveying heat also make it ideal for conveying cooling.

Hydronic Fan Coil Hydronic Fan Coil Hydronic Fan Coil Hydronic Fan Coil Hydronic Fan Coil Hydronic Fan Coil Heat Pump Heat Pump Air Handler Air Handler Image Map

Product Summary

Our Solstice Series Air-to-Water Heat Pumps

SpacePak Solstice Air-to-Water Heat Pumps accomodate almost any home, in any climate. Their environmentally-friendly design and the clean efficient characteristics of hydronics as its primary energy source will deliver whole house comfort - whatever the weather may be.

Hydronic Systems that feature a water-to-water or "ground source" heat pump, are limited on cooling capacities and more of a heating product. SpacePak's Solstice series are true air-to-water heat pumps that can alternate between heating and cooling, providing your family with an all-in-one home comfort solution.

Standard Features

  • Simple Piping & Plumbing
  • Installation & Service Friendly
  • Easily Zoned
  • Green Hydronic Energy


The Solstice SE

The Solstice SE is our standard air-to-water heat pump model, and is ideal for mild climates.

Standard Features

  • Dual Refrigerant Circuits
  • Self Diagnostic Control
  • Low Amp Requirements
  • Quiet Operation
Solstice SE air-to-water heat pump on a black background

The Solstice Extreme

Solstice Extreme pump for heating and cooling on a white background

The Solstice Extreme provides primary heating and cooling even in severe weather climates.

Standard Features

  • Enhanced Vapor Injection allows for low ambient heating application
  • 66,480 BTU/h at 47F Ambient
  • 3.3 Ton of Cooling at 95F Ambient
  • Proven Integrated Control
  • Outdoor Reset

The SpacePake Solstice Extreme Air-to-Water Heat Pump has been awarded the U.S Environmental Protection Agency’s 2019 ENERGY STAR Emerging Technology Award. This award from the EPA aims to advance promising technologies by recognizing innovative products that have the potential to significantly reduce greenhouse gas emissions. This award is a symbol of the environmental leadership role SpacePak has been spearheading since introducing air-to-water heat pumps to the North American market in 2011.

Energy Star 2019 Emerging Technology Ward on white background

System Comparison

SpacePak Solstice Air-to-Water Heat Pumps

  • Up to 30%-50% lower installation cost when compared against Geothermal systems.
  • Little-to-no outdoor excavation needed.
  • Low Amp Requirements
  • Keeps refrigerant outside the home and utilizes a condenser coil that is 30% larger than standard units, improving efficiency.
  • Allows custom control not obtainable by most traditional refrigerant-based systems.
  • Utilizes adjustable water flow, water temperature, and airflow settings, giving you complete control of the system and each temperature zone.
  • Features an intelligent factory-configured control platform, with a self-diagnostic microprocessor that keeps your system running seamlessly.

Geothermal Water-to-Water Heat Pump

  • Water-to-water heat pumps, or geothermal heat-pumps, work by installing multiple “earth loops,” or water lines, throughout your front yard.
  • Expensive to install, especially if vertical bore holes are required for the earth loop, or if you’re connecting multiple earth loops to the heat pump.
  • Most water-to-water heat pumps can only heat your home, but have limited cooling capabilities.
  • Horizontal earth loops require large land areas and major excavation, and most jobs require re-landscaping your yard.
  • Depending on your region, drilling may be necessary for installation.
  • While most geothermal heat pumps claim to be highly efficient, this usually doesn’t include the power required to move flow through the earth loop, which can be substantial.

Case Studies

A Compact Design

The historic First Presbyterian Church of Lancaster, PA needed to replace two 50 ton chillers. Limited area surrounding the building presented extreme challenges in getting a large unit to the roof. Instead of renting a crane and shutting a street down, the Solstice’s compact design made it possible to take the 21 Solstice SE Heat Pumps up the church's elevator to the roof and provide the 105 tons of heating and cooling demanded.

-J & G Heating and Air Conditioning
Historic Presbyterian Church with five Solstice SE heat pumps on the roof
Solstice Heat pump outside an energy-efficient Habitat For Humanity home

Creating an Affordable, Energy Efficient Home with Habitat for Humanity

This year, SpacePak teamed up with the Rutland, Vermont chapter of Habitat for Humanity in support of their most recent project to build a new and highly energy efficient home for a family in need of affordable housing. Efficiency Vermont, the state’s objective advisor on saving energy through efficiency, identified SpacePak’s cold-climate-tested air-to-water heat pump as the ideal solution to deliver affordable heat energy to the home’s hydronic heating system. The house was also equipped with radiant tubing in a concrete slab on the first floor, and baseboard tubing on the second floor. The system consists of two zones, each controlled by a separate thermostat on each floor, allowing the family to program the home’s temperature settings and further reduce their utility bills.