I normally publish and update all my models at MakerWorld. They are only here on Printables to keep the accounts consistent.

Please download the newest version here at MakerWorld.

For bathroom heatings with pipe diameter 20mm and 20mm distance between them. 

Send me a dm if you need other dimensions.

I used ABS with 5 walls. 

PLA could deform if the heating goes over 57°C. So you should use a high temp filament like ABS, PETG, ASA, …