Well first, if they have a debit card issued on the DDA, they should already have an EFT disclosure.
Second, 1026.13(i) Relation to Electronic Fund Transfer Act and Regulation E. If an extension of credit is incident to an electronic fund transfer, under an agreement between a consumer and a financial institution to extend credit when the consumer's account is overdrawn or to maintain a specified minimum balance in the consumer's account, the creditor shall comply with the requirements of Regulation E, 12 CFR 1005.11 governing error resolution rather than those of paragraphs (a), (b), (c), (e), (f), and (h) of this section.
I assume this is an active real DDA account and not a dummy account linked to the HELOC to allow card access. If the later, you are in violation of your debit card issuer's agreement.
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