Contact the which? tech support helpline for jargon-free technical support. Samsung fifth generation kits in conjunction with the smartplumb by joule pre plumbed cylinder ... Installing a new boiler can be a big decision we can help by offering a professional service and expert advice. Cemline electric boilers are provided with a a.s.m.e pressure relief valve the valve is sized to relieve the total btu input of the heating elements. The expansion tank pressure must match.