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This building has 70+rooms and miles of heating pipes with no insulation. Might be a stupid question but is insulating all these pipes worth it? The oil bill is eye watering...
 

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Broadly speaking, unless the rooms are being overheated by the pipes runing through them there is not a lot of point insulating heating pipes that are within the 'thermal envelope' of the building. This is why they weren't insulated in the first place. Pipes that pass through roof spaces, etc. that lose heat directly to the outside do need proper insulating.

For a building of that size guesswork is not a good option. Commission a heating and ventillation engineer to do a survey and make recommendations. It's not just a simple matter of 'heating' that needs to be considered but also ventilation, humidity and condsation, patterns of usage, etc.
 
It’s a one pipe system so inefficient to start will but the bill to upgrade and to lower the bills will be eye watering
 

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