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Towel Warmers

www.merriottuk.comwww.merriott.ie

Content

Style Options 03

Range Overview 02

08Correction Factors

07Features & Options

10How to Order

09Resistance Diagram

05Ares & Venus

06Crystal Straight & Crystal Curved

Edge & Groove 04

What does Merriott stand for?We strive to provide bespoke heating and cooling solutions that are the better choice for commercial applications across the UK and Ireland.

This means investing in world-class production facilities, and manufacturing products of the very highest standard – backed by revolutionary technology, rigorous testing and stringent quality control.

As a company, we have an unwavering commitment to innovation and sustainability, pioneering products that lead the way in design, performance and energy efficiency.

Underpinning all of this is our relationship with our customers: ensuring they can rely on best-in-class service and support, from specification right through to delivery.

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Product DescriptionMerriott Towel Warmers offer outputs from 200 Watts to 1400 Watts at ΔT50˚C

The height ranges for the towel warmers are as follows:• Edge & Groove = 800mm-1800mm• Venus & Ares = 688mm-1720mm• Crystal = 730mm to 1730mm

The widths available for the Edge, Groove, Venus and Ares towel warmers range from 500mm to 750mm. The Crystal is available in widths of 450mm & 600mm..

Outputs All Merriott radiators are manufactured and tested in accordance with BS EN 442.

Finish Merriott towel warmers undergo an intensive pre-treatment process to protect against rust. In pre-treatment, the towel warmers go through a series of washes which degrease the steel and an iron phosphate rinse passivates the surface prior to painting. The primer coat is applied by immersion in an electrophoretic bath to give total coverage of the bare steel and maximum corrosion protection. The durable topcoat (epoxy polyester powder) is electrostatically applied and stove enamel baked at 200˚C. The process is monitored to ensure continuous achievement of optimum adhesion, opacity and gloss levels.

Colour The standard finish for the Edge and Groove is semi-gloss RAL 9016 (white) in epoxy polyester powder. The Venus, Ares and Crystal towel warmers are available in chrome and white.

All chrome towel warmers are polished to a high quality finish.

Range Overview

Packaging The entire surface of the towel warmers, including all 4 corners, is protected by cardboard box ends and packed in shrink wrapped polythene.

ConnectionsStandard connections on all towel warmers are 4 x 1/2” (15mm) BSP connections at E, F, G and H.

TestingEach towel warmer is tested to 1.3 times its maximum allowable working pressure. The maximum allowable working pressure for all bathroom radiators is 5.38 Bar

Dimensional Tolerances Dimensional Tolerances are in accordance with BS EN442.

MaterialsTowel Warmers are made from 1.25mm and 1.5mm thick steel tubes.

Electric Power OptionAll towel warmers can be fitted with an electrical element and can be used when the central heating is not in use. This enables users to have warm dry towels without heating the rest of the house.

Warranty Merriott towel warmers are guaranteed for a period of 10 years from date of purchase in respect of defective materials and workmanship. The system should be designed in accordance with British Standard Code of Practice for Water Based Heating Systems in Buildings BS EN 12828:2012+A1:2014 and BS EN 12831: 2003. The installation and commissioning of the system should comply with BS EN 14336:2004. On completion of the installation the system should be properly flushed and filled in accordance with the British Code of Practice for the Treatment of Water in Domestic Hot Water Central Heating Systems BS 7593:2006, Part L of Building Regulations and Good Practice Guidance for Scotland. Merriott strongly recommend the use of corrosion inhibitor for all applications. Failure to observe these standards may invalidate the manufacturer’s warranty.

ARES Available in both white and chrome

3 x Heights: 688mm, 1118mm and 1720mm.

3 x Lengths: 500 mm, 600mm, 750 mm

VENUS Available in bothwhite and chrome

3 x Heights: 688mm, 1118mm and 1720mm. 3 x Lengths: 500 mm, 600mm, 750 mm

CRYSTAL CURVED Available in both white and chrome

3 x Heights: 730mm, 1160mm, 1730mm.

2 x Lengths: 450mm, 600mm.

CRYSTAL STRAIGHT Available in both white and chrome

3 x Heights: 730mm, 1160mm, 1730mm.

2 x Lengths: 450mm, 600mm.

Style Options

EDGEAvailable in RAL 9016 (white) as standard. Other RAL and BS colours available


3 x Lengths: 500mm, 600mm and 750mm.

GROOVEAvailable in RAL 9016 (white) as standard. Other RAL and BS colours available


3 x Lengths: 500mm, 600mm and 750mm.

/04 05EDGE

Edge 800mm 1200mm 1800mm

Width 500 600 750 500 600 750 500 600 750

Dry weight (kgs) 9.3 10.7 12.9 13.8 16 19.3 22 25.6 30.9

Water content (l) 3.3 3.6 4 4.8 5.2 6 7.7 8.5 9.8

Number of elements 16 16 16 24 24 24 39 39 39

Electric Element to be used 200 200 200 300 300 300 500 500 500

Output (Watts) Output (Watts) Output (Watts)

ΔT50 434 504 609 628 733 890 1005 1172 1423

110

60

WIDTH

LENGTH - 40

GROOVE

Groove 800mm 1200mm 1800mm

Width 500 600 750 500 600 750 500 600 750

Dry weight (kgs) 9 10.4 12.6 13.1 15.7 18.9 20.8 24 30

Water content (l) 3.6 4 4.6 5.4 6 6.9 8.1 9 10.5


Electric Element to be used 200 200 200 300 300 300 500 500 500


ΔT50 393 463 569 578 684 841 888 1044 1279

100 100

82

40

WIDTH

LENGTH - 40

Please note: To be used only on an indirect or closed heating system

WHITE 688mm 1118mm 1720mm

Width 500 600 750 500 600 750 500 600 750Dry weight (kgs) 6 6.9 8.2 9.4 10.9 13 14.5 16.7 20Water content (l) 3.2 3.6 4.4 5.1 5.8 6.8 7.8 8.9 10.6

Number of elements 14 14 14 22 22 22 34 34 34Output (Watts) Output (Watts) Output (Watts)

ΔT50 349 405 488 526 617 753 818 957 1166

Ares & VenusHeat Outputs / Data Charts & Applications

Recommended Electrical Element for Ares

Height/Width 688mm 1118mm 1720mm

500mm 300 Watt 400 Watt 400 Watt



Recommended Electrical Element for Ares Chrome





Ares


Width 500 600 750 500 600 750 500 600 750

Dry weight (kgs) 6 6.9 8.3 9.5 11 13.2 14.6 16.8 20.3

Water content (l) 3.2 3.7 4.4 5.1 5.8 6.9 7.9 9 10.7



ΔT50 349 405 488 526 617 753 818 957 1166

Recommended Electrical Element for Venus





Recommended Electrical Element for Venus Chrome





Venus

Edge & GrooveHeat Outputs / Data Charts & Applications

CHROME 688mm 1118mm 1720mm


ΔT50 219 253 304 346 408 500 538 636 783


Output (Watts) Output (Watts) Output (Watts)ΔT50 219 253 304 346 408 500 538 636 783

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Width 450 600 450 600 600

Dry weight (kgs) 4.88 5.93 8.01 9.67 - 13.88

Water content (l) 2.94 3.58 4.81 5.87 - 8.57

Number of elements 15 15 25 25 - 36

Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 327 380 533 675 - 959

Crystal Curved

Crystal Straight & Crystal CurvedHeat Emissions / Data Charts & Applications

Dip Tubes Standard connections on all towel warmers are 4 x 1/2” (15mm) connections at E, F, G and H. Normal application means the towel warmer is connected up at the E and F connection, with 2 x 1/2” (15mm) airvents at the G and H locations. It is possible, using a dip tube, to pipe up the unit from the top (i.e. at G and H) to ensure overall water distribution. These can be inserted into the product or can be retrofit if required.

Features & Options

Dual Adaptor KitThis will consist of an Electric Element and a T-Piece (illustrated below) and can be used on all towel warmers to achieve heat when the central heating is not being used, during summer months for example.

Dual Adaptor Kits can be retrofitted if necessary.Please note that the size of Electric Element will depend on the size of the towel warmer itself. For more information on sizing, please contact the Merriott Sales Office.


Width 450 600 450 600 600

Dry weight (kgs) 4.8 5.85 7.88 9.54 - 13.7

Water content (l) 2.9 3.54 4.74 5.38 - 8.47

Number of elements 15 15 25 25 - 36

Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 313 397 490 643 - 930

Crystal Straight

Recommended Electrical Element for Ares

Radiator Height Element Order Code Output WattsAll Heights EE002 200


Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 - 276 355 450 - 640


Output (Watts)

Output (Watts)

Output (Watts)

ΔT50 203 265 327 429 - 620

Fig.1 Fig.2

19

15

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The outputs quoted in this brochure are based on a Δ T of 50˚C.

Listed below are the multiplying factors needed to calculate the output at other Delta Ts (ΔTs) between 20ºC and 60ºC. This is done by multiplying your heat output with the appropriate correction factor selected from the table below. Please note more detailed correction factors for towel warmers are available from your local Merriott contact.

EXAMPLE:Required Room Temperature = 21˚C, Low Temperature = 86˚C, Return Temperature = 72˚C

SOLUTION:Mean Water Temperature = (T Flow+T Return)/2 = (86+72)/2 = 79˚C

ΔT = Mean Water Temperature - Required Room Temperature = 79-21 = 58˚C

From the tables below, the output for the towel warmer at ΔT58˚C is 0.962 times the output stated at ΔT50˚C.

Correction Factors

ΔT(˚C) Based on ΔT50 ΔT(˚C) Based on ΔT50

20 0.280 41 0.643

21 0.296 42 0.661

22 0.312 43 0.679

23 0.329 44 0.698

24 0.345 45 0.716

25 0.362 46 0.735

26 0.379 47 0.753

27 0.396 48 0.772

28 0.413 49 0.791

29 0.430 50 0.809

30 0.448 51 0.828

31 0.465 52 0.847

32 0.482 53 0.866

33 0.500 54 0.885

34 0.517 55 0.904

35 0.535 56 0.923

36 0.553 57 0.942

37 0.571 58 0.962

38 0.589 59 0.981

39 0.607 60 1.000

40 0.625

How to calculate the resistance of a Towel Warmer at ΔT 50˚CTowel Warmer Type: Crystal Straight 1160mm LONG x 600mm HIGH

Output @ ΔT 50˚C: 643W (flow/return – 75/65˚C)

If the output is not at ΔT50˚C, please use the correction factor table on the previous page to get the correct output. C – Specific Heat Constant (always 4187 J/kg˚C)Q – (m) x (C) x (ΔT)Output – (flow rate) x (Constant) x (difference between flow and return temp)Watts – (l/s) (J/kg˚C) (˚C)643 – (m) (4187) (10)

Thereforem – 643 / ((4187) X (10))m – 0.015357 (L/S) X 3600 (L/H)m – 55.2852 L/H

Please refer to the resistance diagram which gives a value of approx 9.5mBar.

Resistance

Pres

sure

Dro

p Δ

PW (m

Bar)

Flowrate Vw (l/hr)

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How to Order

Merriott UK (Manufacturing Facility) Merriott, Imperial Park, Newport, Gwent, NP10 8FSTel: +44 (0) 1633 657 000Fax: +44 (0) 1633 681 864

Merriott IrelandDerrylin, Co. Fermanagh, Northern Ireland, BT92 9AUFor contact numbers please see below.

UK EnquiriesTel: +44 (0) 1633 657223Fax: +44 (0) 1633 657215

Irish EnquiriesNorthern IrelandTel: +44 (0) 800 389 9980Fax: +44 (0) 286 774 2998

Republic of IrelandTel: +353 (0) 1800 882 332Fax: +44 (0) 286 774 2998

Email: [email protected] Web: www.merriottuk.com / www.merriott.ie

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