Twin Coil Slimline Cylinder

The Slimline Twin Coil presents the opportunity to combine multiple heat sources into one unit without sacrificing floor space, at only 475mm wide and designed to work with solar thermal the unit can also be upgraded with minimal additional components to accept two boiler inputs. The twin coil unit takes advantage of two high efficiency coil in coil heat exchangers for maximum performance, it is also even possible to link these two together to give one much larger heat exchanger coils.

  • Description
  • Technical Data
  • Tapping Heights


Measuring just 475mm in diameter the RM Slimline Twin Coil unit has been developed to give homeowners with gas boilers the opportunity to capitalise on Solar Thermal technologies. In the age of growing fuel bills, the RM Stainless Twin Coil presents a real option to help save homeowners money and reduce their carbon footprint, thus safeguarding the future of the planet. Built to RM’s usual exacting standards the Slimline Solar Twin Coil is a prefect compliment to you gas boiler and solar needs.


Kit Includes:

Product 150SI 180SI 210SI
Capacity 150L 180L 210L
Height (mm) 1430 1710 1920
Diameter (mm) 475 475 475
Weight Empty (kg) 49 55 58
Weight Full (kg) 194 230 264
Indirect Reheat (mins) 18 22 24
Immersion Reheat (mins) 59 81 95
Heat Exchanger (kW) 16.2 18.4 21
Solar Volume (L) 77 95 101
Standing Loss (kWh/day) 1.6 1.9 2.16
ErP Band C C C
Product 150SI 180SI 210SI
Cold Inlet 162 162 162
Bottom Coil 269 269 344
Stat Pocket 324 324 399
Top Coil 621 665 759
Immersion 672 704 809
Stat Pocket 676 708 813
Secondary Return - - 1552
T&P Valve 1262 1527 1739