Everything arrived on time and so did the engineers but they abandoned the installation because they had burned out the control panel but all credit to Vaillant they delivered the new panel within 30 minutes but the installers quickly loaded their van and were gone within minutes leaving me without heating or hot water for the next 10 days despite my numerous calls to get them to complete their work I am a pensioner aged 84 and need my devices to cope with the winter.although the boiler was finally fitted and works well it's no way to treat a frail old man.