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Maintenance and Service

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Boilers

Viessmann Vitodens 100 W Compact

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Viessmann Vitodens 100 W Compact Outer case fixing clips

Wall mounted gas fired condensing boiler with Inox-Radial heat exchanger with an improved modulation range of 1:4. These new model come with a 5 year comprehensive parts and labour warranty as standard as well as a 10 year warranty on the Inox-Radial stainless steel heat exchanger. The maximum heat output can be adjusted to suit the heat load of the property. This model will run on natural gas or LPG by adding a simple conversion kit.

Its new sturdier casing improves ease of servicing (with all parts easily accessible from the front), reduces the weight and  further reduces the class-leading noise emissions. The problem with this case is that it has removable plastic fixings at the top which are easy to break or to lose after years of servicing and maintenance. This model is quite rear to find in UK properties and not many gas engineers can easily finger out how to remove the casing. They try hard and can often break the clips.

I was doing a gas safety inspection in a property with one of those boilers and found the casing to be loose at the top. This breaks the seal for the air intake chamber and a boiler can use an air from the kitchen to burn gas. I classified this appliance as AR until I can get two clips to fix the cover properly.

The clips part number is 7817500 can be ordered from Parts Centre.

Boiler manual PDF

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