Titanium active anode Termojet with power supply for stainless steel boilers TI 400 G3/4"

Titanium anode TI400 for stainless steel water heaters — an active MMO corrosion protection system for stainless steel tanks with a capacity of 200–500 l. A titanium rod with a catalytic coating of iridium and tantalum oxides (Ir–Ta MMO), paired with a PS type power supply, forms an electrochemical protective potential suited to the specifics of stainless steel surfaces. Connection G3/4", service life — over 10 years. The anode does not dissolve, leaves no sediment, and requires no maintenance whatsoever.

Technical Specifications

Operating Principle

Stainless steel has its own passivating chromium oxide layer that protects the surface in a neutral environment. However, aggressive water containing chlorine, oxygen, and stray currents can destroy this layer and trigger pitting (localised) corrosion — the most dangerous type for stainless steel tanks, as it is invisible from the outside until a through-hole appears.

The PS power supply delivers a constant current of a specified magnitude through the Ir–Ta MMO rod into the water. This current maintains a protective cathodic potential on the stainless steel surface, suppressing pitting corrosion even in chlorinated or soft water. Unlike a sacrificial magnesium anode, the MMO rod does not degrade and requires no replacement.

Important: the PS power supply is calibrated specifically for the parameters of a stainless steel tank. For enamelled water heaters, a different version with a PE power supply unit is used — Titanium Anode TI400 for Enamelled Water Heaters.

Applications

• Stainless steel water heater in a home with aggressive water. Soft water with low mineralisation or chlorinated mains water increases the risk of pitting — TI400 active protection eliminates this risk continuously.
• Large tanks of 200–500 l. For hotels, agritourism accommodations, and cottages with high water consumption — where replacing a magnesium anode requires a system shutdown and qualified service.
• Systems with a heat pump or solar collector. Stainless steel DHW storage heaters where the temperature is frequently maintained in the 50–65°C range — elevated corrosion risk during cyclic heating and cooling.
• Prevention of hydrogen sulphide odour. Active protection suppresses sulphate reduction — the characteristic “rotten egg” smell disappears or never develops at all.

Advantages of Termojet TI400 (for stainless steel)

• Protection against pitting corrosion — the most dangerous type of degradation for stainless steel tanks.
• PS power supply included — the current is precisely matched to the protective potential of stainless steel.
• Does not dissolve — no metallic sediment in the water, complete chemical neutrality of the rod.
• Service life of over 10 years — a single installation for the entire service life of the water heater.
• Installation into a standard G3/4" port with an SW 27 wrench — no draining of the full volume and no special equipment required.

Frequently Asked Questions

A stainless steel water heater doesn't rust anyway — why does it need an anode?
Stainless steel is resistant to uniform corrosion but vulnerable to pitting — especially in water containing chlorine or when the passivating layer is disrupted during welding. Pitting can go unnoticed for years until a microcrack appears. The active TI400 anode maintains a cathodic potential that suppresses pitting — and significantly extends the actual service life of the water heater.

Can one TI400 anode be used for two water heaters?
No. One TI400 anode is designed to protect a single tank with a capacity of 200–500 l. Each water heater requires a separate anode with its own power supply. More suitable accessories are available in the Termojet additional equipment catalogue.