34
Rev. 05/2020
Freeze Protection
The unit comes prefilled with concentrated DOWFROST™ HD corrosion inhibited
propylene glycol. DOWFROST™ HD has Burst Protection to -60 degrees Fahrenheit.
DOWFROST™ HD MUST BE DILUTED WITH APPROVED WATER. Heatmor highly
recommends the use of Pure Water, such as: Reverse Osmosis, Deionized, or Distilled.
Maintain the minimum of a 30% DOWFROST™ HD to approved water ratio at all times.
Before draining the HTF, please refer to “Removal/Replacement of System HTF”.
Only use additives as instructed by your HEATMOR rep., as they may void your
warranty
Adding Freeze Protection Products
Maintain the minimum of a 30% DOWFROST™ HD to approved water ratio at all times. For
additional Freeze and Burst protection refer to the chart below.
For Freeze Protection
For Burst Protection
Temperature
°F °C
Volume %
DOWFROST HD
Volume %
DOWFROST HD
20 (-7)
10 (-12)
0 (-18)
19.1
30.9
38.3
12.8
21.3
25.5
-10 (-23)
-20 (-29)
-30 (-34)
44.7
48.9
53.2
29.8
31.9
35.1
-40 (-40)
-50 (-46)
-60 (-51)
57.4
60.6
63.8
37.2
37.2
37.2
Percent (vol.) DOWFROST HD Fluid Consentration Required
