Economiser External Immersion Heater

The Economiser (Willis) Heater: for fast, economical domestic hot water

The ELEMEX Economiser is a compact, inexpensive unit designed to heat water quickly. It is intended for everyday domestic use, where relatively small quantities of hot water are required, for example: showers, dish washing, hair washing, etc.

Typical use time: > Shower: 10 minutes, > Dish Washing: 5 minutes, > Hair Washing: 5 minutes

Economiser (Willis)

*Internal Reset Button

Willis external immersion heater

The Economiser consumes no more power than a standard immersion heater, but saves on electricity by heating only the amount of water that you require.

The Economiser is fitted externally to the main hot water cylinder. Easy, user-friendly installation ensures the minimum of mess and disruption.

Product CodeThread SizeLengthRatingMounting

The unit comes pre-wired with a 1m flex cable

How it works:

The Economiser is fitted in parallel to the main domestic hot water cylinder and heats the water from the top down. So, for a shower (typical requirement – 35 litres @ 40°C), the Economiser will heat only the top 35 litres of the cylinder in about 10 minutes, and the unit should then be switched off.

For maximum efficiency we recommend that the Economiser be fitted in conjunction with a timer (such as the ELEMEX T1). This will ensure that the heater is switched off after the required time. You can then set it and forget it.

willis heater installation diagram
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