Vaillant circo to M30x1.5 (Heimeier) adapter for elecronic thermostat

Design preview. Rendered from the file, not a photo.

The maker says it fits: Vaillant Circo radiator to M30x1.5 (Heimeier) electronic thermostat. See the proof

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What it does

Easy to grip, easy to use, so a fix takes minutes not hours
Tight-tolerance fit, keeps things working the right way
Smooth finish and fit, so a small problem stops bugging you
Works on day one with no setup needed

A small part can save a whole afternoon. You get a Vaillant circo to M30x1.5 (Heimeier) adapter for built for real, daily use.

Sized to common parts. Tabs and holes line up the first time. Every piece is a 3D print made on demand in the USA.

Place your order and we will print one just for you. Ready to use the day it arrives.

1.6k downloads in the maker community. That is interest in the design on the site it came from, not our sales.

What it fits

The maker says it fits: Vaillant Circo radiator to M30x1.5 (Heimeier) electronic thermostat

That is the maker's word, not a fit we measured. Check the size below against your own.

Vaillant Circo radiator to M30x1.5 (Heimeier) electronic thermostat (model M30x1)From the maker's own listing title, checked 2026-08-13. See the original post

Brand names here only say what this part fits. We are not connected to those companies, and they did not make or check this part.

What you get

This design prints as one piece.
Nothing else to print or buy for this to work.

What it is made of

Designs like this print well in PLA. Compare the materials.

Printed plastic is strong for its size, but it is not metal. We have not load tested this design, so we do not publish a weight rating. Keep it out of a hot car and away from open flame.