RM Cylinders Solar Direct Stelflow 300DS - 1

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RM Cylinders Solar Direct Stelflow 300DS

SKU: 12456
We are continuing to take orders and deliver as usual, and taking all precautions to protect our customers and staff. Visit https://www.tradeplumbing.co.uk/covid-19 for estimated deliveries.

Availability: In stock

Regular Price: £1,697.36

£933.13 (inc VAT)

✝ Subject to stock availability. UK Mainland only. Delivery fees and times to Northern Ireland, Scottish Highlands & Isles, Isle of Man, Isle of Wight, Isles of Scilly, and the Channel Isles may vary. Deliveries are made during working days only.

Product Description


The RM Stelflow Solar Direct cylinder is a mega flow type pressurised stainless steel hot water cylinder. This domestic hot water tank is made in Britain to exacting standards, featuring an efficient solar coil, allowing you to heat your water by an alternative method, such as solar panels, ground source or air source heat pump, whilst having the peace of mind of being able top up the heat with an immersion element, giving high recovery rates, meaning you can run a bath upstairs and still wash up in warm water downstairs. A Direct cylinder heats water by electricity - ideal for homes without gas or oil-fired central heating. These cylinders come with a high efficiency solar coil, an immersion heater, a temperature and pressure relief valve, a 15mm x 22mm tundish, expansion vessel and an expansion vessel hose, meaning your fitter has everything they need to complete your installation. This Unvented hot water tank is Vertical and stands 2041mm high, giving you a capacity of 300 Litres stored hot water.
25 year guarantee
  • 25 Year vessel guarantee.
  • Cylinder components guaranteed for 2 years.
  • Available in a range of styles sizes 90 to 600 litres.
  • A range of horizontal cased units.
  • Coil in coil high effeciency coil - high recovery rates.
  • External expansion for reliability and flexible siting.
  • Full Kiwa Approval.
Additional Features:
  • Minimum recommended working pressure 1 bar.
  • Maximum working pressure 15 bar.
  • All cylinder connections are 22mm compression.
  • Units tested to 15 bar.
  • Minimum water supply 1.5 bar, 20 litres/min.
  • Primary coil circuit must be pumped.
  • Gravity coils available by special order.
  • Stainless steel stat pocket guaranteed against corrosion.
  • Length: 2041mm
  • Diameter: 545mm
  • Capacity: 300 Litres
  • Water Heating System: Solar Direct
  • Vented or Unvented: Unvented
  • Vertical or Horizontal: Vertical


The RM Stelflow has carefully been brought together from quality components and has been designed with performance in mind.

Using our many years of involvement within the hot water industry and out knowledge of bringing unvented cylinders to the market we have created a new stanard in unvented water storage.



RM Cylinders have pushed the boundries even further leaving the competition to catch up once again. Using a state of the art production facility RM Cylinders can produce bespoke Stelflow cylinders, tapping sizes and heights can now be changed to suit your application giving you flexability without compromise.

When altering inlet and outlet connections we can even provide corresponding control kits meaning you still end up with a complete packaged solution, leaving nothing to chance.



Technical Information

Fitting Instructions

Technical Information

Additional Information

SKU 12456
Manufacturer ID 300T
Height 2041mm
Diameter 545mm
-Water Heating System Solar Direct
Guarantee Length 25 Years
Material Stainless Steel
-Vented or Unvented Unvented
-Vertical or Horizontal Vertical
-Capacity 300 Litres
Capacity 300


Here at TradePlumbing.co.uk we have voluntarily extended our returns period to 90 days, as we understand that sometimes there may be the odd item left over from a project or you may have an unexpected delay to a project meaning that you need the added peace of mind when ordering products in case a return is necessary.

We truly believe in being able to offer customers a flexible service and this extended period allows us to go that little extra to help you when in need, as long as goods are returned in the same condition as received we are happy to help.

To return any time initially please email your request to our Customer Support team at customerservice@tradeplumbing.co.uk along with your TP - Order Reference, please allow at least 1 working day for response and we will take it from there.

To View our complete Return Policy Click on Return and Refunds