Unvented Water Heaters

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Download Unvented Water Heater Brochure

Benefits:

  • No sacrificial anode
  • Local support
  • Eliminates corrosion
  • Maximises hot water
  • Fast re-heat times
  • 60mm insulation with outer casing
  • No shower pumps
  • Mains pressure to all outlets
  • Ease of installation
  • Suits all heat sources
  • Reduces installation time
  • Suits large domestic/commercial
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Product construction - typical

Immersion heater 3kw, 240V, 1ph, Incoloy 825, with thermostat incl. cut-out
Thermal insulation CFC/HCFC free, (ODP=0, GWP=1), 60mm fire retardant insulation*
Outer casing P200 Plastisol
Inner cylinder Duplex stainless steel
Heating coil High performance, finned
Indirect thermostat Twin thermostat with independent reset, 30-70ºC
Safety device Factory fitted with 7bar/90ºC pressure & temperature relief valve
Connections Secondary return on 175L & above
*50mm on 400L and 500L vessels

Specifications

Expansion WXI - 3 bar internal expansion with the self-sustaining air-gap system
All other ranges - 3 bar external expansion
Pressure test Tested to 10 bar
Secondary return Standard fit on models 175L & above
Approvals BBA, CE, WRAS, KIWA, ISO, WRC
Guarantee Internal cylinder - 25 years*
Ancillary components 1 year
*Commercial cylinders carry 5 years guarantee
Direct thermostat Element thermostat, nominal setting 60°C
Indirect model 22mm diameter stainless steel high performance coil & outlet with 1 immersion heater
Direct model 80L fitted with 1 immersion heater; 130 - 500L fitted with 2 immersion heaters
Manufacturing All UK using state-of-the-art robot technology
Horizontal & Slimline Suitable for roof voids & 450mmØ specification
Renewables range Solar, heat pump and buffer vessels

Unvented Water Heaters with Venturi Technology

We use Venturi technology in our cylinders to reduce a number of issues with expansion in unvented water heaters. The below diagram depicts the current issues:

Unvented-Water-Heater-Issues.jpg

How Venturi technology works

Water drawn from the mains flows through a patented special inlet device using fluid dynamics to create negative pressure known as the ‘Venturi effect’. With precision design this configuration draws enough air to recharge the air gap as the tank is filled and requires minimal ongoing maintenance.

Venturi-Technology.jpg

 

Products

Solar Direct with single coil

Internal-Expansion-Range-Direct-with-Single-Coil.jpg

Size H D I O T IH1 CR1 CF1 Solar Coil Surface Area
130L 1043 576 182 221 331 454 212 192 0.75m2
150L 1235 576 182 285 395 454 212 192 0.75m2
175L 1370 576 182 397 507 580 212 262 1.1m2
215L 1666 576 182 440 550 524 212 262 1.1m2
255L 1884 576 182 440 550 524 212 262 1.1m2
300L 2150 576 182 450 560 524 212 262 1.1m2
400L 1522 756 220 350 460 538 250 210 1.1m2
500L 1896 756 220 385 495 538 250 210 1.1m2

 

Solar Indirect with twin coil

Internal-Expansion-Range-Indirect-with-Twin-Coil.jpg

CR2 CF2 Aux Coil Surface Area
504 192 0.54m2
504 192 0.54m2
574 262 0.75m2
574 262 0.75m2
574 262 0.75m2
574 262 0.75m2
560 175 0.75m2
560 175 0.75m2

Direct with 3 bar external expansion

Direct-Range-with-External-Expansion.jpg

Size H D I T IH1 IH2
80L 665 576 182 222 196 N/A
130L 957 576 182 222 196 454
150L 1085 576 182 222 196 463
175L 1242 576 182 222 196 545
215L 1484 576 182 222 196 572
225L 1752 576 182 222 196 648
305L 2028 576 182 222 196 725
400L 1405

756

 220 262 235 515
500L 1690 756 220 262 235 660

 

Indirect with 3 bar external expansion

Indirect-Range-with-External-Expansion.jpg

Size H D I T IH1 CR1 CF1 Coil Rating
80L 665 576 182 222 196 213 88 14.6kW
130L 957 576 182 222 196 213 193 14.6kW
150L 1085 576 182 222 196 213 193 14.6kW
175L 1242 576 182 222 196 213 263 20.0kW
215L 1484 576 182 222 196 213 263 20.0kW
255L 1752 576 182 222 196 213 263 20.0kW
305L 2028 576 182 222 196 213 263 20.0kW
400L 1405 756 220 262 235 250 245 27.0kW
500L 1690 756 220 262 235 250 245 27.0kW

Solar Direct with external expansion

Solar-Direct-Range.jpg

Size H D I O T CR1 CF1 SP1 IH1 SR IH2 SP2 Solar Coil Surface Area* Solar Volume
130L 958 578 183 226 226 226 193 183 454 325 349 226 0.75m2 56L
150L 1086 578 183 226 226 226 193 183 509 340 402 226 0.75m2 56L
175L 1243 578 183 226 226 226 267 183 584 473 402 226 1.1m2 69L
215L 1485 578 183 226 226 226 267 183 587 665 476 226 1.1m2 69L
255L 1753 578 183 226 226 226 267 183 587 665 476 226 1.1m2 69L
305L 2029 578 183 226 226 226 267 183 587 665 476 226 1.1m2 69L
400L 1405 755 220 260 260 260 210 220 538 615 425 260 1.1m2 69L
500L 1690 755 220 260 260 260 210 220 538 615 425 260 1.1m2 69L

 

Solar Indirect with external expansion

Solar-Indirect-Range.jpg

Size H D I O T CR1 CF1 SP1 CR2 CF2 IH1 SR SP2 Solar Coil Surface Area Aux Coil Surface Area Aux Coil Rating Solar Volume
130L 958 578 183 226 226 213 193 183 504 193 454 325 226 0.75m2 0.54m2 14.6kW 56L
150L 1086 578 183 226 226 213 193 183 504 193 454 340 226 0.75m2 0.54m2 14.6kW 56L
175L 1243 578 183 226 226 213 267 183 578 263 530 473 226 1.1m2 0.75m2 20.0kW 69L
215L 1485 578 183 226 226 213 267 183 582 263 530 591 226 1.1m2 0.75m2 20.0kW 69L
255L 1753 578 183 226 226 213 267 183 582 263 530 665 226 1.1m2 0.75m2 20.0kW 69L
305L 2029 578 183 226 226 213 267 183 582 263 530 665 226 1.1m2 0.75m2 20.0kW 69L
400L 1405 755 220 260 260 250 210 220 560 175 510 470 260 1.1m2 0.75m2 20.0kW 69L
500L 1690 755 220 260 260 250 210 220 560 175 510 543 260 1.1m2 0.75m2 20.0kW 69L

Slim Direct with external expansion

Slim-Direct.jpg

Size H D I T IH1 IH2
100L 1044 515 179 207 193 550
130L 1326 515 179 207 193 643
150L 1466 515 179 207 193 682
175L 1738 515 179 207 193 832
210L 2010 515 179 207 193 1008

 

Slim Indirect with external expansion

Size H D I T IH1 CR1 CF1 Coil Rating
100L 1044 515 179 207 193 209 320 14.6kW
130L 1326 515 179 207 193 209 320 14.6kW
150L 1466 515 179 207 193 209 320 14.6kW
175L 1738 515 179 207 193 209 400 20.0kW
210L 2010 515 179 207 193 209 400 20.0kW

 

Slim Solar Indirect with external expansion

Size H D I T IH1 CR1 CF1 CR2 CF2 Solar Coil Surface Area Aux Coil Surface Area Aux Coil Rating
130L 1326 515 179 207 504 209 245 554 245 0.75m2 0.54m2 14.6kW
150L 1466 515 179 207 504 209 245 554 245 0.75m2 0.54m2 14.6kW
175L 1738 515 179 207 609 209 350 659 315 1.1m2 0.75m2 20.0kW
210L 2010 515 179 207 609 209 350 659 315 1.1m2 0.75m2 20.0kW

 

Ultra-Slim Direct with external expansion

Size H D I T IH1 IH2
80L 1110 462 165 200 179 -
100L 1344 462 165 200 179 664
130L 1716 462 165 200 179 850
150L 1935 462 165 200 179 1122
165L 1998 462 165 200 179 1221

 

Ultra-Slim Indirect with external expansion

Ultra-Slim-Indirect.jpg

Size H D I T IH1 CR1 CF1 Coil 
80L 1110 462 165 200 179 195 320 14.6kW
100L 1344 462 165 200 179 195 320 14.6kW
130L 1716 462 165 200 179 195 320 14.6kW
150L 1935 462 165 200 179 195 320 14.6kW
165L 1998 462 165 200 179 195 400 20.0kW

Horizontal-Range.jpg

Horizontal Direct

Horizontal-Direct.jpg

Size A
130L 957
150L 1085
175L 1242
215L 1484
255L 1752
305L

2028

 

Horizontal Indirect

Horizontal-Indirect.jpg

Size A B C Aux Coil m2
130L 957 478 298 0.54
150L 1085 543 363 0.54
175L 1242 621 371 0.75
215L 1484 742 492 0.75
255L 1752 876 626 0.75
305L 2028 1014 769 0.75

Heat-Pump-Single-Coil.jpg

Heat Pump single coil with external expansion

Size A B C D E F HP Coil Surface Area*
150L 575 1085 225 284 182 678 2m2
175L 575 1242 225 284 182 720 2m2
215L 575 1485 225 284 182 1035 3m2
255L 575 1752 225 284 182 1035 3m2
275L 575 1884 225 284 182 1035 3m2
305L 575 2028 225 284 182 1035 3m2
400L 750 1405 262 303 228 495 4m2
500L 750 1690 262 303 228 495 4m2

Standard coil inlet and outlet diameter 28mm (DN25); Other coil sizes available upon request.

NEW - with 28mm inlet & outlet - single coil

Size A B C D E F HP Coil Surface Area
400L 750 1405 262 228 228 495 4m2
500L 750 1690 262 228 228 495 4m2

Standard coil inlet and outlet diameter 28mm (DN25); Other coil sizes available upon request.

 

Heat-Pump-Twin-Coil.jpg

Heat Pump twin coil with external expansion

Size A B C D E F G HP Coil Surface Area Solar Coil Surface Area
150L 575 1085 856 355 182 105 385 1.5m2 0.54m2
175L 575 1242 1013 460 182 210 525 1.5m2 0.75m2
215L 575 1485 1259 520 182 270 675 2m2 1.1m2
255L 575 1752 1527 520 182 270 675 2m2 1.1m2
- - - - - - - - - -
305L 575 2028 1800 520 182 270 675 2m2 1.1m2
400L 750 1430 1196 655 276 315 480 3m2 2m2
500L 750 1715 1481 655 276 315 720 4m2 2m2

NEW - with 28mm inlet & outlet - twin coil

Size A B C D E F G HP Coil Surface Area Solar Coil Surface Area
400L 750 1430 1196 655 276 315 480 3m2 2m2
500L 750 1715 1481 655 276 315 720 4m2 2m2