Backyard plumbing repairs and electricity costs

I am the owner of a ground floor unit. The managing agent contacted
me to advise of a leak of a hot water pipe in the backyard. Plumber attended and  I approved to have the leak fixed. The strata manager when advised of my claim for payment of the plumber account refused
to pay for the repairs.

Advice was received from LPMA* it was a common property matter and
after a number of requests the Strata Manager agreed to pay half of the
plumbing repairs, four months after the date of repair. I considered that the chasing of the other half of the account to be futile.

I have now been advised by the managing agent the tenant is
requesting reimbursement for the additional electricity costs incurred while the pipe was leaking into the backyard.

Can you please let me know where I stand on this matter as I will forward the request for reimbursement of electricity costs to the strata
manager.  If I am sure of my facts I will also request the payment of the half of the plumbing costs. It is now ten months since the original plumbing repair.

*The Land and Property Management Authority which earlier this year  evolved into four different bodies, the relevant one for us being Land and Property Information which you can access HERE.