Amtrol is the mainstream-volume indirect water heater brand in the US market. While Triangle Tube innovates with tank-in-tank construction and Lochinvar SQUIRE serves the boiler-brand ecosystem, Amtrol BoilerMate covers the standard indirect application at competitive pricing through its wide US plumbing distribution.
| Amtrol WHS-60Z | Triangle Tube Smart 60 | Lochinvar SIT065 | |
|---|---|---|---|
| Construction | Glass-lined steel + coil | Tank-in-tank stainless | Glass-lined steel + coil |
| Anode rod | Required (every 5-7 yrs) | None | Required |
| Tank warranty | 10 years | Lifetime | 10 years |
| Typical price | $1,299-1,599 | $2,099-2,599 | $1,399-1,799 |
Amtrol wins on price; Triangle Tube wins on construction and warranty; Lochinvar wins on boiler-ecosystem pairing.
Standard indirect tank install. Boiler-loop circulator, aquastat, DHW priority wiring at boiler, tempering valve downstream. See indirect tank install reference.
Amtrol BoilerMate is the mainstream value indirect tank. WHS-60Z for the volume install at the price point most indirect buyers shop. For premium long-term ownership, step up to Triangle Tube Smart Series or Amtrol PI Series stainless coil. For widest plumbing wholesale availability, Amtrol leads.