66 Pa.C.S. § 1529

Any tenant who has made a payment to a utility on account of nonpayment of charges by the landlord ratepayer pursuant to this subchapter may subsequently recover the amount paid to the utility either by deducting the amount from any rent or payment on account of taxes or operating expenses then or thereafter due from the tenant to the person to whom he would otherwise pay his rent or by obtaining reimbursement from the landlord ratepayer.