Solar Heating Fluid - ZM-ProSol LH-T - non toxic glycol - 4L

Solar Heating Fluid - ZM-ProSol LH-T - non toxic glycol - 4L


  4 L Solar Heating Fluid- Pre Mixed ProSol LH-T                                                    Special High Temp Solar Heating Fluid for vacuum tube Read More
  • Shipping Weight: 4kgs
  • Manufactured by: NLSS
5 Units in Stock


4 L Solar Heating Fluid- Pre Mixed ProSol LH-T


Special High Temp Solar Heating Fluid for vacuum tube solar installations. Propylene Glycol 5 Gallons. Premixed reversibly vaporizable special Propylene Glycol-based Heat Transfer Fluid, for solar heating installations.

Modern-day Thermal Solar combo-systems for DHW and space heating are subject of overheating and stagnation because of low heat demand in summer time. Continuing design improvements of solar collectors sig­nificantly change the requirements to the heat transfer fluids regarding its ability to take thermal stress.

However, stagnation temperatures of up to 400ºF (204°C) in flat plate collectors still can be handled by traditionally inhibited solar fluids. In contrast to this, vacuum tube collector temperatures of up to 550ºF (287°C) as reached in vacuum tube collectors require the use of a more ad­vanced fluid containing reversibly vaporizable cor­rosion inhibitors.

Pre-Mixed Pro Sol L-HT propylene glycol/water mix 50%/50%, contains a specially designed industrial package of liquid inhibitors.

The Glycol Mix has been designed especially for use as a heat transfer fluid in solar thermal systems operating under elevated thermal conditions (vacuum tube collectors).

In case of stagnation those components evaporate together with propylene glycol and water, the collector remains empty, and no damaging insoluble residues that may cause any flow obstruction or blocking.

The corrosion inhibitors contained in ProSol L-HT reliably provide protection against acid corrosion, scale and sedimentation formation in systems with materials normally used in solar thermal installations.

Download Product Specification PDF


Physical Properties:

Clear, fluorescent yellow colored liquid
Density 22°C (72°F)
1055.40 kg/m³ (65.88  lb/ft³)
Refractive index 22°C (72°F)
pH value
Reserve Alkalinity (min)
16.0 ml
Viscosity 10°C (50°F)
10.6481mPa·s (10.65 cps)
Boiling point     °C @ 101 kPa 
(°F@ 760 mmHg)
Flash point 
Water content 
46 - 50 %
Frost protection °C /°F
-35 / -31

Return Policy

We want you to be 100% satisfied with your purchase, if you are not, ship it back to us in the original packaging condition and we will refund your purchase less a 10% restocking fee, provided the equipment is received in good condition. Refund offer valid for 30 days from receipt of product.


We feel that being honest is a much better policy to win your trust rather than trying to lure you with nearly impossible statements such as life time warranty. Nothing lasts forever! Our warranty policy is simple; we offer a 3 year warranty on everything we sell and 10 years on our collectors. With this warranty you will get NO hassle next business day replacement (if shipping service and inventory permits). However, as a valued customer you will get technical support through the lifetime ownership of your product. Our Collector do carry longer warranties 10 years from the manufacture. The warranty cover failures that occur during normal operational conditions or manufactures defects. It does not cover failure due to inappropriate operation such as freezing or over heat. Damage caused by vandalism, storms, floods etc. Your household insurance should be modified to cover the system from such situations.


We accept PayPal and Credit card (Visa or MasterCard). If you are ordering multiple units and part, please call us to see if we can save you shipping cost for multiple item orders.



For complete solar kits please allow 2-3 weeks delivery. These kits are shipped via our preferred freight forwarder company and where possible we will schedule residential tailgate delivery (curbside). Heaters and accessories are usually in stock unless indicated otherwise. We do have expedited shipping services available for an additional fee. Please call us if you need a rush order. Once your order has been shipped you will be contacted via email and a tracking number will be provided.

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This product was added to our catalog on Friday 17 October, 2014.