Instantaneous water heater – Advice

  • Fully electronic regulation and electronic regulation or electronic control?

    The equipment levels "fully electronic regulation", "electronic regulation" and "electronic control" determine the degree of DHW convenience and the stability of the outlet temperature.

    STIEBEL ELTRON i technology

    4i technology: DHE SLi

    Four-fold intelligence for limitless premium comfort. For fully electronic control, STIEBEL ELTRON relies on 4i technology. This combines three sensors and a motorised valve. The sensors capture the inlet temperature, outlet temperature and flow rate. Continuous set-actual comparisons ensure accurate temperature delivery. If the appliance were at its maximum output, greater DHW consumption would automatically result in a drop in temperature. To ensure that the required temperature is still maintained even in this case, the motorised valve automatically finely adjusts the amount of water delivered. This means no more unpleasant temperature shocks when showering. The process is totally automatic and not perceived by the user. This considerably increases the comfort factor, especially when several draw-off points need to be supplied at once.

    4i technology maintains the required temperature with constant precision, regardless of showering behaviour or external influences. There is no need to mix in cold water. As a result, only the actual energy required is used which translates into high efficiency. STIEBEL ELTRON's premium model, the DHE SL electronic comfort, provides this exclusive level of comfort based on 4i technology.  

    Go to DHE 27 SLi

    3i technology: DEL SLi and DHB-E SLi

    Three-fold intelligence for a high level of convenience. The appliances with electronic regulation feature 3i technology. This comprises temperature sensors at the inlet, the outlet and a flow sensor. It enables the instantaneous water heater to maintain a constant and accurately held outlet temperature. In exceptional circumstances where the appliance is at maximum output – for example extremely low inlet temperatures in winter – the user can regulate the amount of water using the tap to ensure accurate temperature delivery.

    3i technology is also highly efficient overall, as only that amount of energy and water actually required is used. In this respect, it is on a par with the technology found in the premium class.

    Go to DEL 27 SLi

    2i technology: DHB STi and HDB-E Si


    Two-fold intelligence for everyday DHW convenience. The electronic controlled instantaneous water heaters are equipped with 2i technology, comprising an inlet temperature sensor and a flow sensor. This system calculates the heating output required subject to the selected temperature. Up to three fixed temperature levels can be selected (approx. 35, 45, 55 °C). If a different temperature is required, the temperature can be manually adjusted by mixing in cold water. The energy efficiency of 2i technology is optimised to the energy consumption of the temperature stages.

    Go to DHB 27 STi