Do they offer an after sales service? 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. We could provide you with a fixed-price quote to give you an idea of the type of boiler that could be suitable for your home*** try our free quote tool today, it could take just seconds! To book your boiler service now. How can homeowners.