STELFLOW
The Stelflow made by RM Cylinders creates a new standard in unvented water storage. Apex Plumbing Supplies can order the Stelflow size of your choice, direct or indirect, for next day delivery into our store.
*All prices shown are exclusive of VAT


made to measure stainless
The RM Stelflow has carefully been brought together from quality components and has been designed with performance in mind.
Using thier many years of involvement within the hot water industry and knowledge of bringing unvented cylinders to the market they have created a new standard 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 they can even provide corresponding control kits meaning you still end up with a complete packaged solution, leaving nothing to chance...and this fantastic product can be purchased at Apex Plumbing Supplies.
stelflow specification
The following outlines the standard specification:
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.
stelflow advantages
Stelflow has the following advantages:
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.
standard units
Built using years of experience in the cylinder market, RM Cylinders has manufactured a strong and reliable product. With its superior insulation values and 25 year guarantee, the Stelflow is perfectly suited for today's homes.
direct

Click to enlarge
Code |
90D |
120D |
150D |
180D |
210D |
250D |
300D |
Capacity |
90L |
120L |
150L |
180L |
210L |
250L |
300L |
Height |
727(F) |
915(F) |
1102(F) |
1290(F) |
1478(F) |
1728(F) |
2041(F) |
Diameter |
545 |
545 |
545 |
545 |
545 |
545 |
545 |
Cold Inlet |
129(A) |
120(A) |
150(A) |
180(A) |
210(A) |
250(A) |
300(A) |
Imm 1 |
242(B) |
242(B) |
242(B) |
242(B) |
242(B) |
242(B) |
242(B) |
Imm 2 |
|
519(C) |
619(C) |
719(C) |
819(C) |
959(C) |
1109(C) |
Secondary |
|
|
|
|
1009(D) |
1259(D) |
1509(D) |
T&P Valve |
515(E) |
703(E) |
890(E) |
1078(E) |
1266(E) |
1516(E) |
1829(E) |
Price |
£379.00 |
£385.00 |
£398.00 |
£422.00 |
£443.00 |
£482.00 |
£539.00 |
indirect

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Code |
90I |
120I |
150I |
180I |
210I |
250I |
300I |
Capacity |
90L |
120L |
150L |
180L |
210L |
150L |
300L |
Height |
727(H) |
915(H) |
1102(H) |
1290(H) |
1478(H) |
1728(H) |
2041(H) |
Diameter |
545 |
545 |
545 |
545 |
545 |
545 |
545 |
Cold Inlet |
105(A) |
105(A) |
105(A) |
105(A) |
105(A) |
105(A) |
105(A) |
Bottom Coil |
299(B) |
299(B) |
339(B) |
374(B) |
374(B) |
374(B) |
374(B) |
Imm 1 |
339(C) |
339(C) |
379(C) |
379(C) |
414(C) |
414(C) |
414(C) |
Stat Pocket |
354(D) |
354(D) |
394(D) |
394(D) |
474(D) |
569(D) |
669(D) |
Imm 2 |
|
|
|
|
|
959(E) |
1109(E) |
Secondary |
|
|
|
|
1159(F) |
1409(F) |
1609(F) |
T&P Valve |
515(G) |
703(G) |
890(G) |
1078(G) |
1266(G) |
1516(G) |
1829(G) |
Price |
£440.00 |
£457.00 |
£472.00 |
£503.00 |
£510.00 |
£565.00 |
£618.00 |
direct solar

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Code |
150DS |
180DS |
210DS |
250DS |
300DS |
Capacity |
150L |
180L |
210L |
250L |
300L |
Height |
1102(H) |
1290(H) |
1478(H) |
1728(H) |
2041(H) |
Diameter |
545 |
545 |
545 |
545 |
545 |
Cold Inlet |
105(A) |
105(A) |
105(A) |
105(A) |
105(A) |
Bottom Coil |
299(B) |
299(B) |
374(B) |
374(B) |
374(B) |
Stat Pocket |
354(C) |
354(C) |
429(C) |
429(C) |
429(C) |
Immersion 1 |
702(D) |
734(D) |
839(D) |
914(D) |
1039(D) |
Immersion 2 |
619(E) |
719(E) |
819(E) |
959(E) |
1109(E) |
Secondary |
890(G) |
1078(G) |
1266(G) |
1516(G) |
1829(G) |
Price |
£594.00 |
£620.00 |
£638.00 |
£667.00 |
£720.00 |
slimline units
Introducing the slimmest Stainless Steel unvented cylinder on the market, perfect for fitting through loft hatches and restricted airing cupboard entrances. Reduced size without any compromises on quality.
direct

Click to enlarge
Code |
60SD |
90SD |
120SD |
150SD |
180SD |
210SD |
Capacity |
60L |
90L |
120L |
150L |
180L |
210L |
Height |
645(F) |
930(F) |
1195(F) |
1470(F) |
1735(F) |
1980(F) |
Diameter |
475 |
475 |
475 |
475 |
475 |
475 |
Cold Inlet |
173(A) |
173(A) |
173(A) |
173(A) |
173(A) |
173(A) |
Immersion 1 |
223(B) |
223(B) |
223(B) |
223(B) |
223(B) |
223(B) |
Immersion 2 |
|
|
733(C) |
916(C) |
1093(C) |
1256(C) |
Sec Return |
|
|
|
|
|
1676(D) |
T&P Valve |
448(E) |
733(E) |
998(E) |
1273(E) |
1538(E) |
1783(E) |
Price |
£00.00 |
£00.00 |
£539.00 |
£554.00 |
£578.00 |
£601.00 |
indirect

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Code |
60SI |
90SI |
120SI |
150SI |
180SI |
210SI |
Capacity |
60L |
90L |
120L |
150L |
180L |
210L |
Height |
645(H) |
930(H) |
1195(H) |
1470(H) |
1735(H) |
1980(H) |
Diameter |
475 |
475 |
475 |
475 |
475 |
475 |
Cold Inlet |
399(D) |
399(D) |
399(D) |
474(D) |
474(D) |
474(D) |
Bottom Coil |
299(A) |
299(A) |
299(A) |
339(A) |
339(A) |
374(A) |
Immersion 1 |
339(B) |
339(B) |
379(B) |
379(B) |
414(B) |
414(B) |
Stat Pocket |
354(C) |
354(C) |
354(C) |
394(C) |
394(C) |
474(C) |
Immersion 2 |
|
|
|
|
|
1256(E) |
Sec Return |
|
|
|
|
|
1676(F) |
T&P Valve |
448(G) |
733(G) |
998(G) |
1273(G) |
1538(G) |
1738(G) |
Price |
£00.00 |
£00.00 |
£00.00 |
£646.00 |
£665.00 |
£687.00 |

horizontal units
Produced to the same specification as Stelflow cylinders, the horizontal varient offers increased siting options allowing larger storage capacities in areas that would not normally accomodate standard vertical cylinders.
direct

Click to enlarge
Code |
120DH |
150DH |
180DH |
210DH |
250DH |
300DH |
Capacity |
120L |
150L |
180L |
210L |
250L |
300L |
Length |
941 |
1128 |
1316 |
1504 |
1754 |
2067 |
Diameter |
545 |
545 |
545 |
545 |
545 |
545 |
Hot Draw |
215(A) |
215(A) |
215(A) |
215(A) |
215(A) |
215(A) |
T&P Valve |
311(B) |
311(B) |
311(B) |
311(B) |
311(B) |
311(B) |
Immersion 1 |
420(C) |
420(C) |
420(C) |
420(C) |
420(C) |
420(C) |
Sec Return |
|
|
|
974(D) |
1224(D) |
1537(D) |
Immersion 2 |
571(E) |
758(E) |
946(E) |
1134(E) |
1384(E) |
1697(E) |
Drain Valve |
291(F) |
291(F) |
291(F) |
291(F) |
291(F) |
291(F) |
Cold Feed |
571(G) |
758(G) |
946(G) |
1134(G) |
1384(G) |
1697(G) |
Price |
£00.00 |
£00.00 |
£791.00 |
£829.00 |
£887.00 |
£993.00 |
indirect

Click to enlarge
Code |
120IH |
150IH |
180IH |
210IH |
250IH |
300IH |
Capacity |
120L |
150L |
180L |
210L |
250L |
300L |
Length |
941 |
1128 |
1316 |
1504 |
1754 |
2067 |
Diameter |
545 |
545 |
545 |
545 |
545 |
545 |
Hot Draw |
215(A) |
215(A) |
215(A) |
215(A) |
215(A) |
215(A) |
T&P Valve |
311(B) |
311(B) |
311(B) |
311(B) |
311(B) |
311(B) |
Immersion 1 |
470(C) |
564(C) |
658(C) |
752(C) |
877(C) |
1033(C) |
Sec Return |
|
|
|
974(D) |
1224(D) |
1537(D) |
Boiler Flow |
711(E) |
898(E) |
1086(E) |
1274(E) |
1524(E) |
1837(E) |
Boiler Return |
211(F) |
211(F) |
211(F) |
211(F) |
211(F) |
211(F) |
Drain Valve |
291(G) |
291(G) |
291(G) |
291(G) |
291(G) |
291(G) |
Cold Feed |
571(H) |
758(H) |
946(H) |
1134(H) |
1384(H) |
1697(H) |
Price |
£00.00 |
£00.00 |
£840.00 |
£882.00 |
£933.00 |
£1055.00 |