Direct Large Unvented

Designed for the large domestic and light commercial market the Direct Large Unvented extends RM's product catalogue even further. Building on the same technology found in our smaller units the Direct Large Unvented proves invaluable when large stores of water are necessary for the appplication.

  • Description
  • Technical Data
  • Tapping Heights


The RM Stainless large Unvented Direct cylinder has been designed from the ground up to offer capacities beyond our standard range while keeping the core product the same. Built to suit large domestic and light commercial duties the product proves versatile enough for almost all situations where this is a call for large stores of Unvented Hot Water.

Because the core principals of the cylinder have been kept the same as our standard range, the installation procedures are exactly the same, meaning simple and straight forward installation. In addition RM have continued their customer commitment and the range comes complete with a 5 year guarantee, ensuring a long trouble free service and hot water for many years to come.

Product 400D 500D 600D
Capacity 400L 500L 600L
Height (mm) 1505 1830 2205
Diameter (mm) 690 690 690
Weight Empty (kg) 64 80 96
Weight Full (kg) 464 580 696
Immersion Reheat (mins) 345 446 563
Standing Loss (kWh/day) 2.8 3.2 3.9
ErP Band D D D
Product 400D 500D 600D
Destrat Connection 250 250 250
Immersion 1 300 300 300
Cold Feed 482 482 482
Immersion 2 650 850 1050
Immersion 3 1125 1450 1825
Destrat Connection 1125 1450 1825
Secondary Return 1230 1550 1925
T&P Valve 1250 1570 1945