Are Triangle Tube Challenger boilers discontinued?

Yes.

While Triangle Tube was still operating, Challenger Solo / Combi had already been replaced in the lineup by Prestige / Instinct series.

After the November 2025 shutdown, Challenger parts are in the same leftover-stock situation as the rest of the brand.

Many of the Triangle Tube boilers already installed are older lines that were discontinued before the shutdown. Parts for those lines were already thinning before the shutdown, so a model-specific failure on one of them is the least likely to find a replacement part.

First-generation Prestige controls (MCBA-era) and later CTRLMAX / ACVMax generations do not share a single parts catalog.

Last reviewed 2026-11-01. Accurate to the best of our knowledge as of that date. Things change — that's why the date is there.