Due to supply chain issues, our lead times are running longer than usual. Please contact us with any urgent shipping needs.

Boat Freeze Protected Solar Water Heating Kit: With External Heat Exchanger

Regular price $1,099.00

Shipping calculated at checkout.

Please allow for longer lead times.

This kit contains everything you need to add a high quality solar water heater to your boat. If your boat water heater does not have a built-in heat exchanger but you still want to install a freeze protected (closed loop) system this kit is for you. Included is a compact stainless steel heat exchanger (316 alloy) and all other parts required for a closed loop system. The antifreeze in the solar loop is heated by Heliatos MH-38 solar water heating panel. This panel has unbreakable twinwall polycarbonate glazing that can withstand hail and other debris. Its strong aluminum frame makes it tough yet lightweight, only weighing 12 lbs.

The MH-38  panels include special features to prevent corrosion even in the harshest marine environments:

  • Powder-coated frame and backing, gives the appearance of white enamel
  • Zinc-phosphate internal corrosion protection
  • Sealed construction
  • Stainless steel hardware

These panels have unbreakable twinwall polycarbonate glazing, and a strong aluminum frame, yet only weighs 12 lbs.


Each kit comes with:

  • Your selected quantity of Heliatos MH-38 Solar Water Heating Panel 
  • HS-21 Heliatos solar circulation pump
  • 1 TopsFlo TD5 Stainless Steel Circulation Pump 
  • 1 25 Watt PV Solar panel to power the pump 
  • Wire and PV panel mounting tabs 
  • 25 ft of 1/4" PEX tubing
  • Amtrol #15 Expansion Tank
  • RV/Marine Glycol Fill and Purge Valve with Drill Pump and Instructions
  • Compact Stainless Steel (Alloy 316) Heat Exchanger
  • 1 Complete Set of Fittings and Adapters
    • Assumes Marine water heater with 1/2" NPT connections (most common)
    • Contact us for non-standard Water Heaters or Connections
  • Clear and easy to follow installation instructions 

All You have to supply is:

  • Fasteners to attach the panels
  • Insulation for the tubing
  • Your existing Marine water heater
  • Tools needed for installation
Click here to see how many panels you need.