The new Grant Vortex Outdoor Condensing Combi's come complete with a built-in multi-directional low level flue and can be either fixed against any suitable external wall, or installed freestanding allowing for the necessary clearances around the flue terminal.
Both of the new models incorporate unique 35 plate-heat exchangers, which due to their low water content and larger surface area, increase the domestic hot water performance by up to 60% over existing boilers.
Boiler Connections
| |
Outdoor Combination Models |
| Model |
21 |
26 |
36 |
| Output kW |
21 |
26 |
36 |
| Output Btu/h |
70,000 |
90,000 |
123,000 |
| Flow Connection |
22mm |
22mm |
28mm |
| Return Connection |
22mm |
22mm |
28mm |
| Cold Water In |
15mm |
15mm |
22mm |
| Hot Water Out |
15mm |
15mm |
22mm |
| Pressure Relief |
15mm |
15mm |
15mm |
| Condensate Pipe |
3/4" (19mm) Plastic "Overflow" Pipe |
Dimensions
All dimensions in millimetres:
Grant Vortex Outdoor 21, 26, 36

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The Grant Vortex Condensing Combi's are extremely compact in size and have a number of features not usually found on oil-combination boilers.
Both of the new models incorporate unique 35 plate-heat exchangers, which due to their low water content and larger surface area, increase the domestic hot water performance by up to 60% over existing boilers.
Boiler Connections
| |
Indoor Combination Models |
| Model |
21 |
26 |
36 |
| Output kW |
21 |
26 |
36 |
| Output Btu/h |
70,000 |
90,000 |
123,000 |
| Flow Connection |
22mm |
22mm |
28mm |
| Return Connection |
22mm |
22mm |
28mm |
| Cold Water In |
15mm |
15mm |
22mm |
| Hot Water Out |
15mm |
15mm |
22mm |
| Pressure Relief |
15mm |
15mm |
15mm |
| Condensate Pipe |
22mm Plastic Plumbing Pipe |
Dimensions
All dimensions in millimetres:
The Combi 21 and 26

The Combi 36 
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