Bosch sells through multiple channels in the US. The right channel depends on which product family you're buying.
1. Bosch-trained installer (recommended for Greentherm and Greenstar)
Bosch-trained installers complete factory training and have direct distributor parts access. Find through bosch-homecomfort.com / dealer locator.
- Has Greenstar combi hydronic install experience (critical for combi)
- Bosch service software access
- Submits warranty claims directly
2. Plumbing wholesalers
Ferguson, Hajoca, Winsupply stock the full Bosch catalog including Greenstar combi. Generally require account but increasingly serve walk-in retail.
3. Home Depot / Lowe's
Strong on Tronic POU mini-tanks (volume product). Carry select Greentherm and Greenstar models. Tronic Heat 3000 sometimes in stock.
4. Amazon
Best for Tronic POU mini-tanks — wide selection from Bosch America and authorized sellers. Greentherm and some Tronic Heat also available. Buy only from Bosch America or top-rated authorized seller.
Channel comparison
| Channel | Greentherm | Greenstar | Tronic POU | Tronic Heat |
|---|---|---|---|---|
| Bosch-trained installer | Best | Required | Skip | OK |
| Plumbing wholesaler | Good | Good | OK | Good |
| Home Depot / Lowe's | Limited | Limited | Good | Sometimes |
| Amazon | OK | No | Best | Good |
Bottom line
Tronic POU: Amazon or big-box, DIY install fine. Greentherm: Bosch-trained installer or wholesale; Home Depot/Lowe's OK for budget pick. Greenstar combi: Bosch-trained hydronic installer only — never DIY. Tronic Heat: verify electrical capacity first, then any installer who has done electric tankless before.