Greenstar Heatslave 18/25
Description
The Greenstar Heatslave combi oil boilers are suitable for installing in a kitchen. They have a pre-heated thermal store which provides you with instant hot water and they’re G3 compliant.
As floor standing boilers they can be installed under a removable worktop, provided there’s enough access for clearance and maintenance.
They are compatible with an optional plug-in time clock.
5 year boiler guarantee between 1st April and 30th June 2012 (terms and conditions apply). See promo page for details.
Central heating output: 18-25kW
Domestic hot water flow rate: 18 litres per minute at 35 degree temperature rise.
Efficiency
Print a handy summary about this product
Features and benefits
- Best official boiler efficiency rating (SEDBUK band A)
- 5 year boiler guarantee 1st April - 30th June 2012, terms and conditions apply (standard guarantee: 2 years)
- 5 year guarantee on primary heat exchanger
- 10 year guarantee on secondary heat exchanger
- Pre-heated thermal store – instantly heated hot water
- Optional fascia mounted programmer
- Robust quality manufacture
Technical data table
| Technical data | |
|---|---|
| Title | Value |
| Height (mm) | 855mm |
| Width (mm) | 520mm |
| Depth (mm) | 600mm |
| Weight | 177kg |
| SEDBUK Value/band | 90.1% Band A |
| Solar compatible | No |
| Minimum diameter flue CF | 100mm |
| Minimum diameter flue RS | 80/125mm |
| Mains cold water inlet | 15mm |
| Domestic hot water outlet | 22mm |
| Primary vent | 3/4" inch BSP |
| Primary cold feed | 1 inch BSP |
| Heating flow and return connections | 22mm |
| Condensate connection | 21.5mm polypropylene |
| Oil connection | 10mm |
| Max. primary static head | 30 metres |
| Maximum flow temperature | 55/81°C |
| Min. primary static head | 1 metre |
| Primary water content | 69 litres |
| NOx class | Class 3, 209mg/kWh |
| Water side resistance 20°C | 110 mbar |
| Exhaust flue gas mass flow | 40kg/hr |
| Control thermostat differential | 5°C |
| Power consumption | 240W |
| Ingress protection rating | 20 IP |
| Flue reset overheat thermostat (cut out) (°C) | 110°C |
| Boiler manual reset overheat thermostat (cut out) | 105°C |
| Boiler high limit thermostat (cut out) (°C) | 92 |
| Maximum hearth temperature | 100°C |
| Maximum horizontal flue RS | 6,000mm |
| Maximum vertical flue RS | 12,000mm |
| Power supply | 230 AC V 50Hz |
Literature
| Product guides and brochures | ||||
|---|---|---|---|---|
| Title/description | Part number | Order | ||
| Greenstar oil boiler brochure Help on choosing the best oil boiler to heat your home. |
8 716 110 393 | |||
| Product guide - oil boiler and solar heating Quick pocket-sized reference for trade professionals on oil boilers and solar water heating. |
8 716 116 256 | |||
| Product literature | ||||
|---|---|---|---|---|
| Title/description | Part number | Order | ||
| Greenstar Heatslave 12/18 and 18/25 fascia panel information | 8 716 109 857 | |||
| Installation and servicing instructions (boilers manufactured from May 2012) | 6 720 802 432 | |||
| Installation and servicing instructions (boilers manufactured until April 2012) | 8 716 106 252 | |||
| Product bulletin: new Greenstar Oilfit plume management kit | Oil PB 01/2011 | |||
| Tech and spec for Greenstar Heatslave | 8 716 110 392 | |||
| User manual for Greenstar Heatslave | 8 716 106 253 | |||
| Accessory literature | ||||
|---|---|---|---|---|
| Title/description | Part number | Order | ||
| Digital twin channel programmer instructions | 8 716 105 796 | |||
| Tech and spec for heating controls | 8 716 115 653 | |||
| Flue literature | ||||
|---|---|---|---|---|
| Title/description | Part number | Order | ||
| Greenstar Oil internal flue kit (80/125mm) and plume management kit instructions | 6 720 645 523 | |||
| Greenstar Oilfit external balanced flue installation instructions | 6 720 646 882 | |||
| Greenstar Oilfit flexible flue system installation instructions | 8 716 114 290 | |||


Social media