Hi,
You can deduct expenses from your rental income when you work out your taxable rental profit as long as they are wholly and exclusively for the purposes of renting out the property.
As long as the new heating system is the closest equivalent in capability, then the replacement system will be a revenue repair. However, if the previous owner disconnected and removed the system, this would suggest that the system was not in place when you purchased the property. If that is the case, then this would be a capital expenditure.
Provided the oven is replaced with a similar standard oven and does the same job as before, then this is a repair and the expenditure is allowable. The replacement beds will also be allowable expenditure. Accountant’s fees incurred through your rental business are an allowable expense. Further information can be found here:
BIM46920 - Specific deductions: repairs and renewals: what is a repair: different materials
BIM46925 - Specific deductions: repairs and renewals: what is a repair: changing technology
Thank you.