If the Bosch unit you have there has 4 push buttons along the front then follow these instructions to light it.
1. Firstly press in the button that has a solid round circle on it – this will allow the unit to be reset, 2. Press in an hold in hard the left hand button which will allow gas to pass to the pilot burner, while holding this button hit press in and release the button on the RH side that has a picture of a lightening strike on it – this is the sparker to light the pilot burner. Once the pilot burner is burning continue to hold in the laft hand button for a further 20 seconds then slowly release that button.3. Push in the button next to it that has a large flame on it and your water heater is now up and running. The instructions to light the heater are on the sticker on the RH side panel.
Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians