Purchased both the heated water and sewer hose from these guys for an Airstream we are renting out all winter long. We are based in the Tetons where you really feel winter's grip. It is not uncommon to have day and night time temps in the single digits or colder.
Let me tell you, these hoses are the real deal! So thankful we found these guys. Even better than the product is the customer service, super friendly and helpful folks. Highly recommend for anyone living in their RV in the winter months or cold temps. Tried countless other products and they all froze up or broke.