poor heaters

I have been using two EZ Heat solar heating panels in my pool for years with good results.

Unfortunately, I need to replace one panel and the manufacturer, Harter Industries is no longer in business. These panels were made of rubber and allowed a good deal of expansion/contraction when an unexpected fall frost hit. 10 years ago I switched to another brand which was similar but had smaller diameter tubing and was made of polypropelene or polyurethane, a harder plastic. These developed numerous blowouts as water did not drain as well, became trapped and froze. Can anyone suggest a suitable replacement for a colder climate?