Wall-mounted gas boiler range

The R40 Evolution range encompasses six models delivering between 56 and 138kW output; while for larger commercial requirements, modules can be combined to form a Modupak solution, offering capacities up to 1102kW.

The ultra-high efficiency of the Evolution boiler derives from the single or double-helix heat exchanger (dependent on model), which not only uses low water volume, but reduces hydraulic resistance and thereby the electrical consumption of the pump. Additionally, being made from high grade 316 austenitic stainless steel ensures longevity for the heat exchanger, as well as greatly improved reliability.  

While many high efficiency boilers feature aluminium heat exchangers, Stokvis says the Evolution’s stainless steel alternative will continue to resist both the build-up of limescale, and the patination on the outside due to hot gases: both of which impede the transfer of heat. Furthermore, Stokvis uses robotic laser welding techniques to join the exchanger tube and fins, ensuring efficient heat transfer.  

All of this attention to detail results in a Seasonal Space Heating Efficiency for the Stokvis Evolution boiler range, measuring as high as an impressive 92.5%. Either individually or in cascade installations, the boilers can achieve this performance consistently.  

The R40 Evolution also features a fully insulated casing, – along with weather compensation and DHW control –  while other environmental benefits include its very clean NOx Class 6 rating under EN 15502: with readings in the range from 22 to 42mg/KWh. Meanwhile CO₂ levels are between 8.2 and 9%. 

The Modupak concept  comprises of a frame-mounted cascade of up to eight boiler units in a back-to-back configuration, or up to six modules in a linear formation.  For speed of installation, it is supplied as a complete package, which includes the pumps, pipework and valves; as well as the header, dirt and air separator, manifolds, insulation, flues and control system.

The Stokvis Modupak, with the R40 Evolution boilers are supplied in distmantled form, making it easy for retrofitting in the tightest of plant room spaces. Indeed, the individual sections are easily moved through restricted access routes.

Eco-friendly and with multiple cascade choices, the R40 Evolution and its virtually limitless Modupak options, make this new boiler range from Stokvis one of the most flexible on the market.