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Monoblock Air to Water Heat Pump Kit - Single Tank

Jun. 16, 2025

Monoblock Air to Water Heat Pump Kit - Single Tank

Monoblock Air to Water Heat Pump Kit HPATWMSCTLM- One Thermal Storage tank and Accessories

Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $6,244.00 | / Model HSS030V2LM HSS060V2LM HSS080V2LM Tank Size 100L 200L 300L 400L 500L Quantity Chevron down icon Quantity This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted.

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Return Policy: We accept return within 30 days of receipt of your orders. Restocking fee applies on some returned Products. Returned Items shall have intact labels, packages and shall not have been used. for more info.

  • Full refund if you do not receive your ordered items. 
  •  Partial Refund for partially not received or damaged items

Introduction

This kit is a for customers with limited budget and space in their mechanical room. It has only one thermal storage tank with one or two indirect coils. and it's mainly for space heating and cooling (either heating or cooling) and Domestic Hot Water (DHW) Pre-Heating through the indirect coil, only when heat pump is not in cooling mode. When Heat Pump is in cooling mode, the 3 way valve by passes the indirect coil.

Included in this kit:

  1. Air to Water Heat Pump
  2. Single Compartment Thermal Storage Tank
  3. Circulation Pump Grundfos UPMXL 25-124 (230V)
  4. Three Way Valve - 3/4" diameter
  5. Expansion Tanks: 2.1 US Gallons for the DHW Line and 4.5 US Gallons for the Space Heating Main Line

Not Included in this kit:

Back up Heating Boiler, its expansion tank and circulation pump, Piping, Fittings and anything not included above.

Hydronics | Solstice Air-to-Water Heat Pumps - SpacePak

  • We're hard at work updating our website to support our increasingly popular and growing hydronic product offering.

    Check out the recent updates below, and be sure to come back soon for more new content on its way.

    For all inquiries, contact your local SpacePak Representative.
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SpacePak, Hydronics, &
Air-to-Water Heat Pumps

In addition to being the innovator of small duct high velocity systems, SpacePak is also the industry leader in air-to-water heat pump technology since we first introduced the modern hydronic solution to the North American market back in .

Thanks to our parent company Mestek and its 75 year-long history as a leader in hydronic heating and cooling, SpacePak has found itself uniquely qualified to provide the levels of training and support required for us to be the driving force behind the adoption of this exciting and promising technology.

With thousands of rock-solid installations across the US and Canada, we've taken our original Solstice heat pump technology that's proven itself in the field over the last decade, and upgraded our product offering with the inclusion of the latest innovations in inverter technology.

Hydronic Heating & Cooling
with Air-to-Water Heat Pumps

  • Environmentally friendly heating and cooling for residential and light commercial settings
  • The physics that make water ideal for conveying heat also make it ideal for cooling
  • All the advantages of a hydronic (water) distribution system without the use of fossil fuels
  • Combines the performance of modern air-source heat pump technology with the unsurpassed comfort of hydronics
  • 30% more efficient than traditional air-source heat pumps
  • Energy savings up to 47% greater than a typical high efficiency natural gas condensing boiler
  • Up to 70% less electricity use than electric baseboard

Basic Hydronic System Layout

The graphic reflects the design flexibility afforded with air-to-water heat pumps and the diverse array of hydronic emitters available to choose from for operation in a modern hydronic low temperature system.

SpacePak Hydronic Fan Coil Options

  • Low Temperature HighWall
  • Low Temperature ThinWall
  • Small Duct High Velocity Hydronic Air Handler

Third Party Emitter Options

  • Radiant Panels (Floors, Ceilings, Walls)
  • Low Temperature Hydronic Baseboard
  • Panel Radiators (not represented in graphic)

Solstice Heat Pumps
Industry Leading Air-to-Water Technology

Industry Proven Technology for Reliability, Performance, & Longevity

  • High COP hydronic heat pumps that supply low temperature water for heating & chilled water for cooling
  • Thousands of installations across the US and Cananda
  • Industry proven Solstice technology
  • Eligible for rebates!
  • Extended warranty for SpacePak Certified Contractors:
    • Industry leading 10-year compressor warranty
    • 5-year parts warranty
Solstice Inverter Monobloc Solstice Inverter Split

Solstice® R32 Series 

The latest addition to SpacePak’s industry-leading Solstice heat pump line utilizes low GWP R32 refrigerant in a safe and future-proof monobloc design. Built on SpacePak’s trusted air-to-water technology and taken to new levels of sustainability, efficiency, performance, and convenience.  An all-in-one solution for sustainable and carbon-free heating, cooling, and domestic hot water.

Solstice Inverter Monobloc
Air-to-Water Heat Pump

The Solstice Inverter Monobloc (SIM) is an air-source heat pump ideal for a wide variety of climates and applications and offers low ambient cooling capabilities.

The monobloc design makes it a self-contained unit that keeps all refrigerant conveniently located outside the occupied space.

Standard Features

  • Supplies Low Temperature Water for Heating & Chilled Water for Cooling
  • Reliable Mitsubishi Inverter Compressor
  • Low Ambient Cooling Capabilities
  • 42-130°F Delivered Water Temperatures (Controls on Return)
  • Available in 3- and 5-ton Models
  • Domestic Hot Water Offset
  • Monobloc Design (No On-Site Refrigerant Charging)
  • Keeps all Refrigerant Outside the Occupied Space
  • Freeze Protection
  • Modbus Compatible
  • Low Amp Draw with Ultra Quiet Operation
  • User Friendly Advanced Color Touch Screen Control (24ga shielded 5 wire. Can be remote mounted up to 600ft)
  • Precision Temperature Control Platform
  • DC Driven Fan Motors
  • Eligible for Rebates
  • Industry Leading 10-Year Compressor Warranty & 5-Year Parts Warranty for Certified Contractors

SIM-036 (3 ton)

Heating Capacity Range: 13,200 - 38,700 Btu/h*
Cooling Capacity Range: 1 – 3 tons*
COP: up to 5.01*
EER: up to 12.97*

SIM-060 (5 ton)

Heating Capacity Range: 25,400 – 70,600 Btu/h*
Cooling Capacity Range: 1.5 – 5 tons*
COP: up to 4.67*
EER: up to 11.60*

For more Monobloc Heat Pumpinformation, please contact us. We will provide professional answers.

*Using AHRI 550/590 Test Criteria

Solstice Heat Pumps Brochure (HPB-6).pdf

SIM-036, SIM-060 Submittal Data Sheet (SD-SIM-).pdf

SIM Installation Manual (IAW2-).pdf

Solstice Inverter Extreme
Air-to-Water Heat Pump

The Solstice Inverter Extreme (ILAHP) is a low ambient or "cold climate" air-source heat pump capable of extreme low ambient heating performance down to -22°F.

The monobloc design makes it a self-contained unit that keeps all refrigerant conveniently and safely located outside the occupied space.

Standard Features

  • Supplies Low Temperature Water for Heating & Chilled Water for Cooling
  • Reliable Toshiba EVI Inverter Compressor
  • High Performance Heating in Cold Climates Extremes Down to -22°F
  • 42-130°F Delivered Water Temperatures (Controls on Supply)
  • Available in 4-ton model
  • Domestic Hot Water Offset
  • Monobloc Design (No On-Site Refrigerant Charging)
  • Keeps All Refrigerant Outside the Occupied Space
  • Freeze Protection
  • Low Amp Draw with Ultra Quiet Operation
  • Modbus Compatible
  • User Friendly Advanced Color Touch Screen Control (24ga shielded 5 wire. Can be remote mounted up to 600ft)
  • Precision Temperature Control Platform
  • Inverter Driven Fan Motors
  • Eligible for Rebates
  • Industry Leading 10-Year Compressor Warranty & 5- Year Parts Warranty for Certified Contractors

ILAHP (4 ton)

Heating Capacity Range: 21,000 - 62,000 Btu/h*
Cooling Capacity Range: 1.7 – 4.3 tons*
COP: up to 5.41*
EER: up to 12.13*

*Using AHRI 550/590 Test Criteria

Solstice Inverter Split
Air-to-Water Heat Pump

The Solstice Inverter Split (SIS) is a low ambient or "cold climate" air-source heat pump capable of extreme low ambient heating performance down to -20°F.

The split system design provides installers with the flexibility to reduce the use of glycol in the hydronic loop.

Standard Features

  • Supplies Low Temperature Water for Heating & Chilled Water for Cooling
  • Reliable Panasonic EVI Inverter Compressor
  • High Performance Heating in Cold Climate Extremes Down to -20°F
  • 42-130°F Delivered Water Temperatures (Controls on Supply)
  • Available in 5-ton Model
  • Split Design Provides the Flexibility to Reduce the Use of Glycol in the Hydronic Loop
  • SIS System Includes both indoor and Outdoor Units, Refrigerant Line Set (35'), and Control Wire (50')
  • Simple Indoor Piping Similar to Wall Hung Boilers
  • Freeze Protection
  • Low Amp Draw with Ultra Quiet Operation
  • User Friendly Touch Screen Control
  • Precision Temperature Control Platform
  • DC Driven Fan Motors & EC Modulating Fans
  • Eligible for Rebates
  • Industry Leading 10-Year Compressor Warranty & 5- Year Parts Warranty for Certified Contractors

SIS-060A4 (5 ton)

Heating Capacity Range: 20,500 - 71,500 Btu/h*
Cooling Capacity Range: 2.5 - 5.2 tons*
COP: up to 3.09*
EER: up to 12.5*

*Using AHRI 550/590 Test Criteria

Solstice Heat Pumps Brochure (HPB-6).pdf

SIS-060 Submittal Data Sheet (SD-SIS-).pdf

SIS Installation Manual (SIS2-).pdf

Better than Geothermal

Air-to-Water

  • 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 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

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.

Are you interested in learning more about Commercial Heat Pump Manufacturer? Contact us today to secure an expert consultation!

Looking for Answers?

Contact your local SpacePak Representative for product, installation, and sales support. Contact

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