Devices for heating water and storing it in boilers or hot water tanks shall be so designed and installed as to prevent all danger of explosion and also prevent a back flow of hot water through a meter connected with a public water supply.
Del. Code tit. 16, § 7913
Hot water tanks or boilers
47 Del
Official source: Delaware Code Online. Reproduced from public-domain Delaware statutes; confirm against the official source for the current text. Not legal advice.