A modular liquid heating assembly includes a plurality of liquid delivery modules in series. The liquid delivery modules each include a module body having an inlet fitting, an outlet fitting, and a plurality of vessel coupling ports. The vessel coupling ports each include inflow and outflow orifices. The inlet and outlet fittings and the plurality of vessel coupling ports are in serial communication with each other through respective inflow and outflow orifices of the plurality of vessel coupling ports. At least one of the liquid delivery modules are configured for coupling with an inflow liquid line coupled with a liquid reservoir. Similarly at least one of the liquid delivery modules are configured for coupling with an outflow liquid line coupled with the liquid reservoir.