Underground heat pipes for every underground belt tier, including Advanced Belts. Quality heat pipes heat a bigger area and reach further, and heat pipes can be cast in the foundry. Continuation of Underground heat pipe by Quezler for Factorio 2.1.
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
Version: 3.0.0
Date: 2026-11-08
Major Features:
- Continuation of Underground heat pipe (Quezler) and Underground heat pipe forked (OC1024) for Factorio 2.1.
- Advanced Belts (shm-advanced-belts) support: superior, ultra, hyper and absolute underground heat pipes. Their length follows Advanced Belts' own underground length settings.
- Quality heat pipes (from Quality Heat Pipes by Bunshaman): heat pipes heat a larger area with quality. Uses Better Quality (Reborn)'s quality library when it is installed, its own variants otherwise.
- Underground heat pipes also heat a larger area with quality.
- Underground heat pipes reach further with quality: +1 tile per quality level by default (legendary +5), the same as Better Quality (Reborn)'s "Constant" underground belt length. When Better Quality (Reborn)'s underground belt length option is on, its rule is used so belts and heat pipes match.
- Casting heat pipe recipe for the foundry (from Casting heat pipe by KCKy), with the same settings. Left out when Casting heat pipe itself is installed.
Compatibility:
- Thermal Plant, Thermal Tap and Pre-Heated Exchanger (Meddleman): building them over an underground heat pipe no longer hooks them into its hidden pipe, Thermal Plant connector overlays update when an underground heat pipe connects to it, and Thermal Tap refreshes its heat helper.
- Any modded entity with heat connections is handled, not only the vanilla ones.
- Saves with Underground heat pipe or its fork carry over: entity names and startup settings are unchanged, and the hidden pipes are rebuilt on load.
- Saves with Quality Heat Pipes carry over: its quality heat pipes are turned back into normal heat pipes with their quality and swapped to the new variants.
Bugfixes:
- Fixed a crash when an underground heat pipe's slot was missing while it was removed.
- Fixed a crash when a heat entity was built over an underpass that was not tracked.
- Fixed cloning duplicating the hidden pipes.
- Underpasses are removed when their two ends no longer pair.
- Flipping an underground heat pipe updates it like rotating.
- Icons and graphics keep the colours of modded underground belts.