Keston Combi 2 30kw and 35kw Output Combi Boiler Owner’s Manual
Features & specification
Offering first-class comfort in a compact, wall-hung appliance small enough to fit inside a standard kitchen cupboard*, the Keston Combi 2 range enables heating and hot water to be controlled independently, ensuring maximum comfort and efficiency.
Keston Combi 2 can be sited almost anywhere in the home, without the need for a separate tank. And because it connects to the unique Keston Twin Flue system, the boiler can be situated anywhere up to 27** metres from the flue outlet, helping to provide further flexibility when required.
Fully modulating, and with weather compensation, Keston Combi 2 provides excellent energy savings, making it the perfect choice for new or replacement installations alike.
THE FACTS
- 7 year warranty†
- Easy to see pressure gauge
- Large backlit display with user friendly controls
- Low lift weight
- Low component count maximising reliability
- Compact dimensions
- Twin flue up to 27m
- 50mm muPVC (PVC-C) solvent weld flue allowing simple, cost effective installations
- Weather compensator supplied as standard making Keston Combi 2 Boiler Plus compliant out of the box
- Pre-fitted filling loop
- Inbuilt frost protection
- Fully modulating
- LPG conversion kit available
7 year warranty when installed with a Keston 22mm System Filter and registered within 30 days of installation. 5 year parts & labour warranty as standard. Terms and conditions apply.
- Please check
cupboard size prior to installation. - For the maximum total equivalent flue length, please refer to
the installation manual. - The only systems approved for this application are: Marley muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe System 2000 muPVC (PVC-C) Solvent Weld Waste System (50mm), Polypipe Terrain Solvent Weld System (50mm) and Wavin Osma PVC-C Solvent Weld System (50mm). Please use the recommended Solvent Weld Cement for each system.
DIMENSION & CLEARANCES
Specification Data
| CENTRAL HEATING | C30 | C35 | |||
| CH Output @ 70°C | Max | kW | 24.2 | 24.2 | |
| Max | kW | 6.1 | 7.1 | ||
| CH Output @ 40°C | Max | kW | 25.6 | 25.6 | |
| Min | kW | 6.4 | 7.5 | ||
| CH Input | Nett CV Max | kW | 24.3 | 24.3 | |
| Nett CV Min | kW | 6.1 | 7.1 | ||
| CH Input | Gross CV Max | kW | 27.0 | 27.0 | |
| Gross CV Min | kW | 6.7 | 7.9 | ||
| CH Gas Consumption | Max | m3 /h | 2.512 | 2.512 | |
| Min | m3 /h | 0.627 | 0.734 | ||
| HOT WATER | C30 | C30 | |||
| DHW Output | Max | kW | 30.3 | 35.3 | |
| DHW Input | Nett CV M | kW | 30.4 | 35.4 | |
| DHW Input | Gross CV Max | kW | 33.7 | 39.3 | |
| DHW Gas Consumption | m3 /h | 3.135 | 3.657 | ||
| DHW Flow Rate at 35°C Rise | l/min | 12.4 | 14.5 | ||
| DHW Specific Rate | l/min | 14.5 | 16.9 | ||
| OTHERS | C30 | C35 | |||
| Seasonal Efficiency | SEDBUK 2005 | % | 91.1 | 91.1 | |
| SEDBUK 2009/2012 | % | 89.6 | 89.6 | ||
| Seasonal Space Heating Efficiency Class | A | A | |||
| NOx Classification | Class 6 | Class 6 | |||
| GENERAL DATA | C30 | C30 | |||
| Max Horizontal Flue Length | m | 27 Flue / 2 Air | 27 Flue / 2 Air | ||
| Max Horizontal Flue Length (Parallel) | m | 18 Flue / 18 Air | 15 Flue / 15 Air | ||
| Flue Terminal Diameter | mm | 50 | |||
| Gas Supply | 2H – G20 – 20mbar | ||||
| Gas Supply Connection | 15mm copper compression | ||||
| Injector Size | 15mm copper compression | ||||
| Injector Sizemm | 4.65 | 4.90 | |||
| Flow Connection (CH) | 22mm copper compression | ||||
| Inlet Connection (DHW) | 22mm copper compression | ||||
| Inlet Connection (DHW) | 15mm copper compression | ||||
| Outlet Connection (DHW) | 15mm copper compression | ||||
| Average Flue Temp – Mass Flow Rate (DHW) | 68°C – 13g/s | 73°C – 15g/s | |||
| CO2 Content (±0.7) (Min CH) | % | 8.5 | 8.8 | ||
| CO2 Content (±0.7) (Max DHW) | % | 9.3 | 9.7 | ||
| Max Working Pressure (Sealed Systems) | bar (psi) | 2.5 (36.3) | |||
| Max DHW Inlet Pressure | bar (psi) (kPa) | 10.0 (145) (1000) | |||
| Min DHW Inlet Pressure | bar (psi) (kPa) | 1.3 (18.9) (130) | |||
| Electrical Supply | 230V – 50Hz | ||||
| Power Consumption | W | 93 | 110 | ||
| Fuse Rating | External 3A / Internal: T4A HRC L250V | ||||
| Water Content (CH) | l (gal) | 1.2 (0.26) | |||
| Water Content (DHW) | l (gal) | 1.0 (0.22) | |||
| Weight (Packed) | kg | 32.9 | 32.9 | ||
| Maximum Installation Weight | kg | 28.6 | 28.6 | ||
Example Flue Installation
Keston Combi 2 C30 – Flue & Air Pipe Length
Flue Pipe Length [m]
acceptable flue operating area
Graph indicates maximum flue run 27m with 2m air. Also, 18m flue with 18m air pipe for parallel twin flue run.
C53 HORIZONTAL
Calculations:
Flue
Elbows 3 x 1m = 3m
Straights 4+6+1.5+1 = 12.5m
Total = 15.5m
Air
Elbows 2 x 1m = 2m
Straights 6+2+0.1+1 = 8.1m
Total = 10.1m.
Keston Combi 2 C35 – Flue & Air Pipe Length
Flue Pipe Length [m
acceptable flue operating area
Graph indicates maximum flue run 25m with 2m air. Also, 15m flue with 15m air pipe for parallel twin flue run.
C13 HORIZONTAL
Calculations:
Flue
Elbows 3 x 1m = 3m
Straights 4+3.5+1.5+2.5 = 11.5m
Total = 14.5m
Air
Elbows 4 x 1m = 4m
Straights 2+2+3.5+4+0.15 = 11.65m 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Total = 15.65m
The following minimum clearances must be maintainedfor operation and servicing.
Front of boiler – 450mm†
Sides of boiler – 2.5mm
Above boiler – 350mm, with 30mm above the flue
Below boiler – 100mm†
Dimensions:
| KESTON COMBI 2 | |
| Height | 700mm |
| Width | 395mm |
| Depth | 278mm |
- Or equivalent length.
- Can be reduced to 5mm for cupboard fit, 450mm required for servicing.
Tel: 01482 443 005 Fax: 01482 467 133
Keston Heating, PO Box 103, National Avenue, Kingston Upon Hull HU5 4JN
Keston.co.uk
