Stelflow Commercial

Stelflow Stelflow

Stelflow Commercial

The RM Stelflow large Unvented Cylinder range has been designed from the ground up to offer storage 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 for almost all situations where there 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 Range



Stelflow commercial indirect hot water cylinders are pre-insulated pressurised units. The cylinder is floor standing and manufactured from Duplex LDX 2102 3mm stainless steel sheet thickness and AISI 316L with 4mm thickness.

Multi Energy

Multi Energy

Stelflow Multi Energy Cylinders are pre-insulated stainless steel tanks with multiple connections and with engineering of the tank to take advantage of heat stratification at different levels
ensure that the Stelflow Multi Energy tanks has unparalleled flexibility.

Due to the unique design of the our Stelflow Multi Energy tank they are the perfect partner for Solar, Heat Pumps, Pellet Burners, Heat Recovery Systems, District Heating applications and more.

Twin Solar

Twin Solar

The Stelflow Twin Solar range features a dedicated solar coil for optimum efficiency when use with a solar system. The Stelflow Twin Coil is a perfect unvented cylinder suitable to solar system integration for the production of domestic hot water.

Online Tools


Easily manage your quotes and bypass filling out long forms when registering your RM Cylinder product warranties. The User Dashboard allows you to have all your details kept in a single place.


All your product information kept filed in one place. Browse our Knowledge Centre to view and download technical data, install manuals and brochures.

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