Indirect water heater for a wide range of applications. The ITS is fitted with 2 single-wall spiral heat exchangers. This appliance is available in capacities varying from 289 up to 1007 litres.


  • Capacity: 289 – 1007 litres
  • Single-wall spiral heat exchangers
  • PermaGlas Ultra Coat second-generation glass coating technology prevents corrosion
  • ITS 300: Three adjustable legs facilitate easy installation
  • ITS 400-1000: Insulated ring base for easy installation
  • Insulated cleanout door for comprehensive waterside maintenance
  • Replaceable magnesium anode
  • Removable control column for convenient servicing


  • Flexible anode for installation in confined areas
  • Temperature and pressure valve with stainless-steel spring set to 95°C and a maximum water pressure of 7 bar
  • Analogue temperature gauge (0-120°C)
  • Power anodes
  • Single and three phase electric elements

Ecodesign specifications

ITS 300 400 500
Load profile:
Energy efficiency class: E E E
Energy efficiency:

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As a manufacturer of high-end appliances A.O. Smith claims to maximize user convenience and comfort. Therefore, we must be able to support and guarantee that our products run impeccably. Customer satisfaction throughout the service life of our products, that´s A.O. Smith´s promise.
By offering a comprehensive range of services (such as sizing, commissioning, service and maintenance) A.O. Smith validates that promise.