Dad can provide a minor credit card/debit card, they are very popular these days with spend limit. Many platforms allow you to set spend limit. It's also possible to turn on a heater and forget to turn it off by a minor and accure mega electricity bill and same is true if your data is being charged per unit data consumed by your internet provider. In none of those cases, refund would be provided.
A heater has not been psychologically engineered to incite minors to turn it on.