A pump (100) includes a pump block (102) including a heater (140), a middle block member (120) and an upper block member (122). Cylinder sleeves (130) are disposed between the middle and upper block members, and a piston assembly (160) is disposed in the block with pistons (162) reciprocatingly disposed in the cylinder sleeves. A drive motor (90) drives a twin gear assembly (170) and slave gears (168) to drive the pistons. Headers (104, 105) channel fluid from an external source to the cylinder sleeves, and from the cylinder sleeves to the heater. The heater includes a plurality of heaters such as cartridge heaters (150) that heat the received fluid. In the preferred device, A-side and B-side component are simultaneously pumped. The heater includes A-side and B-side flow paths for heating the components. The pressurized fluid(s) is dispensed through outlets (108, 110).