I have an old Reynolds Solar Hot Water Heater and would like to uninstall/remove it safely. All my solar panels were removed years ago but the tank is still here. COLD and HOT lines leading to solar water heater already CUT/DISCONNECTED. I want to uninstall everything correctly and prevent any glycol spraying all over the place.
First picture 1 & 2 were connected to solar panels and have the glycol in them. 3 is the HOT and 4 is the COLD water supply. Zoom in picture of where the lines meet the tank.
Model diagram I found that uses similar plumbing (2 pumps, steel reservoir, glycol, minus the expansion tank)
SHUT DOWN PROCEDURE: (taken from their manual) Depending on the requirement, not every step needs to be followed. 1. Unplug the controller. 2. If required, attach a hose to the System Drain Valve. 3. Open the System Drain Valve and drain HTF to a container if it has a propylene glycol additive. If not, discharge the HTF to a drain or ground. !!!CAUTION: SYSTEM HTF CAN BE HOT!!! 4. Close the System Drain Valve.
Steps I am planning on doing in the following order:
- Attach hose to drain relief valve at bottom of water heater and evacuate all the water
- Pull lever on T&P valve to release excess pressure or water remnants
- Release all pressure in Expansion tank by depressing the schrader valve
- ??? Attach hose to the OUT fitting of the glycol and turn the knob to open up the system and drain into bucket. Dispose of chemicals properly. ???
- Disconnect pipes 1, 2, 3, 4 with pipe wrench from the water heater tank
EDIT: For #4 step, is that the correct method? I've seen refrigerators and car ac systems use a vacuum to evacuate the glycol, preventing it from releasing into the atmosphere (assuming it's toxic: polyethylene glycol). Do plumbers usually use a vacuum or just a hose + bucket? Again, want to avoid spraying water/glycol all over the place when disconnecting everything. Am I missing any safety steps? I want the system to be bone dry and depressurized.