Solaroll water heater

Sam, there are several ways to repair the panel if the manifold is copper. If the hole is large or blown out from freezing, you can cut out the problem and replace the tee and pipe using slip couplings. If the holes are just leaks or small pinholes, you can just clean the area very well down to the bare copper, then solder over the hole. (You can do this with large holes too if you can solder well.)
  If the rest of the unit is rubber or plastic, be sure to disconnect the manifold first, if possible, or cover it with a very wet rag to protect it from the heat from your torch. 
 Or lastly, clean the affected area and use some type of epoxy.
 

Thanks John

The problem is not in the copper but where the rubber tubes enter the copper manifold.  There are some little plastic inserts which seem to have gotten distorted.  I will try epoxy or marine sealant.  This is a good idea: I appreciate it.

Sam

Sam, if the epoxy doesn't hold. Since those panels have many tubes, you can just eliminate the tube that leaks. Just cut it and seal the end, either with a plug and hose clamp or melt it together, and then seal the opening for it at the header/s the same way, (you may be able to solder the header end/s closed).