Since construction is simple, construction was not difficult, I thought that the thermostat was definitely attached. Since it is thing to be sold separately, I think that it is better to pay attention to those who purchase it. The effect is unknown yet because it is before the winter season.
There are various products when it is for iron pipes because the price is cheap, but there is not much choice if it is for railway poly, and the price is not cheap.
It is in the early winter season and it is not operated yet. It can also be used for resin pipes and construction can be done easily even by an amateur. The unit price per meter is about 3000 yen. I wish I could make it a bit more cheap.
I do not know because it is not cold enough to be frozen, I do not understand how to install it well, but I tried to devise myself. Since we had to attach a power thermostat separately (because of our PVC pipes) it was appreciated that there was a set of items.