The ecoTEC plus combi boilers, have compact dimensions and one of the lowest weight in their class (from 36.8kg) - meeting the growing demand from installers and end users for smaller, lightweight appliances. The ecoTEC combi models have powerful DHW performance (from 23kW) and come complete with Vaillants AquaComfort system. This incorporates a warmstart facility, providing instantaneous hot water delivery and a controlling system to ensure a constant hot water temperature. ecoTEC plus boilers have a built-in expansion vessel of 10 litres and an LPG conversion kit is also available.