Heating & hot water included in service charge. Is there a cut off?

Hi, I'm looking for some advice. Me and my partner have recently started renting a flat. Since moving in we've been constantly chasing the letting agency and building management to find out who our heating supplier is.

We were becoming increasingly concerned as heating meter was showing a higher than usual usage despite not having the heating on, both of us being at work all day and minimal hot water usage. Chatgpt was estimating a bill of £160.

We finally managed to find out from the building management that the heating is included in the service charge and 'we don't need to worry about it'.

This is our first time renting a flat where heating isn't a separate utility so neither of us are familiar with this set up so we have some questions.

• is there no cap on the amount of heating/hot water we use? (Not that we plan to increase our usage)?
• Does the service charge remain a flat rate - not affected by heating/hot water usage?
• What's the purpose of the meter if we aren't being charged for usage?

Sorry if these are daft questions, we are both terrified of getting slapped with a massive unexpected bill.

Thank you