Baxi 800 System 2 Gas System Boiler - 818 / 824 / 830 (7814313 / 7814314 / 7814315)
The Baxi 800 System 2 is a premium wall-hung condensing gas system boiler offered in three outputs — 18 kW (818), 24 kW (824), and 30 kW (830) — giving every installer the right size for every job. Compared to the 600 series, the 800 System 2 steps up to a class-leading 10-year parts and labour warranty and includes a factory-supplied Adey MagnaClean Micro2 magnetic system filter in the box, keeping sludge and magnetite out of the heat exchanger from day one. A stainless steel heat exchanger, brass hydraulic block, ErP A-rating, and 93% seasonal efficiency make this an outstanding choice for medium to large homes or any installation where the customer demands maximum peace of mind.
The 10-year parts and labour warranty — compared to 7 years on the 600 series — makes the 800 System 2 the recommended choice whenever the customer prioritises long-term protection. Register at baxi.co.uk/registration within 30 days of installation and ensure annual servicing to keep the warranty fully valid.
Every 800 System 2 ships with a compact Adey MagnaClean Micro2 magnetic system filter in the box. This protects the boiler and heating circuit from magnetic and non-magnetic debris from the outset, reducing breakdowns and maintaining heat exchanger efficiency over the boiler's life.
A stainless steel heat exchanger paired with a robust brass hydraulic block provides excellent corrosion resistance and long-term structural integrity — two of the key factors behind the extended 10-year warranty commitment.
All three models achieve 93% seasonal efficiency with an ErP A-rating for central heating, helping to keep annual gas bills meaningfully below those of older non-condensing boilers while meeting current Building Regulations energy efficiency requirements.
The pre-heated siphonic condensate trap warms and discharges condensate in one go rather than a slow trickle, dramatically reducing the risk of frozen condensate pipes during cold weather and the associated boiler shutdowns and engineer callouts.
All three models can be manually converted between natural gas (G20) and LPG (G31) by a Gas Safe engineer without purchasing an additional accessory kit, making the 800 System 2 suitable for off-grid properties as well as mains gas installations.
Certified OpenTherm modulating control allows the boiler to communicate continuously with compatible thermostats (including Nest and Hive) to vary output rather than switching on and off. The optional Baxi uSense Wi-Fi thermostat adds full smartphone and tablet scheduling.
The built-in EasyFill permanent filling link enables homeowners to top up system pressure without a temporary hose or engineer visit, reducing unnecessary callouts and keeping the heating system operating at correct pressure between annual services.
Despite the premium specification, the 800 System 2 measures just 700 mm H × 344 mm W × 285 mm D and fits comfortably inside a standard 290 mm-deep kitchen or utility cupboard, with all pipework neatly routed behind a built-in stand-off frame.
The 800 System 2 is certified to operate on natural gas blended with up to 20% hydrogen (H₂), future-proofing the installation against planned UK grid decarbonisation changes without requiring any hardware changes.
| Specification | 818 System 2 | 824 System 2 | 830 System 2 |
|---|---|---|---|
| Baxi Part Number (MPN) | 7814313 | 7814314 | 7814315 |
| Heat Output (kW) | 18 kW | 24 kW | 30 kW |
| Boiler Type | Wall-hung condensing gas system boiler | ||
| Seasonal Efficiency | 93% | 93% | 93% |
| ErP Energy Rating | A | A | A |
| Heat Exchanger | Stainless steel | Stainless steel | Stainless steel |
| Hydraulic Block | Brass | Brass | Brass |
| Gas Type | NG (G20) / LPG (G31) | NG (G20) / LPG (G31) | NG (G20) / LPG (G31) |
| Hydrogen Compatibility | Up to 20% H₂ | Up to 20% H₂ | Up to 20% H₂ |
| CH Flow Temp Range | 25–80 °C | 25–80 °C | 25–80 °C |
| Max System Pressure | 3 bar | 3 bar | 3 bar |
| Electrical Supply | 230 V / 50 Hz | 230 V / 50 Hz | 230 V / 50 Hz |
| Dimensions (H × W × D) | 700 × 344 × 285 mm | 700 × 344 × 285 mm | 700 × 344 × 285 mm |
| Noise Level | 49 dB | 52 dB | – |
| Included Filter | Adey Micro2 | Adey Micro2 | Adey Micro2 |
| Controls Compatibility | OpenTherm; Baxi uSense (optional) | OpenTherm; Baxi uSense (optional) | OpenTherm; Baxi uSense (optional) |
| Cylinder Compatibility | Baxi cylinders; Megaflo Eco | Baxi cylinders; Megaflo Eco | Baxi cylinders; Megaflo Eco |
| Warranty | 10 years P&L (Adey filter must be registered simultaneously) | 10 years P&L (Adey filter must be registered simultaneously) | 10 years P&L (Adey filter must be registered simultaneously) |
Original: $2,305.24
-65%$2,305.24
$806.83More Images
Baxi 800 System 2 Gas System Boiler - 818 / 824 / 830 (7814313 / 7814314 / 7814315)
The Baxi 800 System 2 is a premium wall-hung condensing gas system boiler offered in three outputs — 18 kW (818), 24 kW (824), and 30 kW (830) — giving every installer the right size for every job. Compared to the 600 series, the 800 System 2 steps up to a class-leading 10-year parts and labour warranty and includes a factory-supplied Adey MagnaClean Micro2 magnetic system filter in the box, keeping sludge and magnetite out of the heat exchanger from day one. A stainless steel heat exchanger, brass hydraulic block, ErP A-rating, and 93% seasonal efficiency make this an outstanding choice for medium to large homes or any installation where the customer demands maximum peace of mind.
The 10-year parts and labour warranty — compared to 7 years on the 600 series — makes the 800 System 2 the recommended choice whenever the customer prioritises long-term protection. Register at baxi.co.uk/registration within 30 days of installation and ensure annual servicing to keep the warranty fully valid.
Every 800 System 2 ships with a compact Adey MagnaClean Micro2 magnetic system filter in the box. This protects the boiler and heating circuit from magnetic and non-magnetic debris from the outset, reducing breakdowns and maintaining heat exchanger efficiency over the boiler's life.
A stainless steel heat exchanger paired with a robust brass hydraulic block provides excellent corrosion resistance and long-term structural integrity — two of the key factors behind the extended 10-year warranty commitment.
All three models achieve 93% seasonal efficiency with an ErP A-rating for central heating, helping to keep annual gas bills meaningfully below those of older non-condensing boilers while meeting current Building Regulations energy efficiency requirements.
The pre-heated siphonic condensate trap warms and discharges condensate in one go rather than a slow trickle, dramatically reducing the risk of frozen condensate pipes during cold weather and the associated boiler shutdowns and engineer callouts.
All three models can be manually converted between natural gas (G20) and LPG (G31) by a Gas Safe engineer without purchasing an additional accessory kit, making the 800 System 2 suitable for off-grid properties as well as mains gas installations.
Certified OpenTherm modulating control allows the boiler to communicate continuously with compatible thermostats (including Nest and Hive) to vary output rather than switching on and off. The optional Baxi uSense Wi-Fi thermostat adds full smartphone and tablet scheduling.
The built-in EasyFill permanent filling link enables homeowners to top up system pressure without a temporary hose or engineer visit, reducing unnecessary callouts and keeping the heating system operating at correct pressure between annual services.
Despite the premium specification, the 800 System 2 measures just 700 mm H × 344 mm W × 285 mm D and fits comfortably inside a standard 290 mm-deep kitchen or utility cupboard, with all pipework neatly routed behind a built-in stand-off frame.
The 800 System 2 is certified to operate on natural gas blended with up to 20% hydrogen (H₂), future-proofing the installation against planned UK grid decarbonisation changes without requiring any hardware changes.
| Specification | 818 System 2 | 824 System 2 | 830 System 2 |
|---|---|---|---|
| Baxi Part Number (MPN) | 7814313 | 7814314 | 7814315 |
| Heat Output (kW) | 18 kW | 24 kW | 30 kW |
| Boiler Type | Wall-hung condensing gas system boiler | ||
| Seasonal Efficiency | 93% | 93% | 93% |
| ErP Energy Rating | A | A | A |
| Heat Exchanger | Stainless steel | Stainless steel | Stainless steel |
| Hydraulic Block | Brass | Brass | Brass |
| Gas Type | NG (G20) / LPG (G31) | NG (G20) / LPG (G31) | NG (G20) / LPG (G31) |
| Hydrogen Compatibility | Up to 20% H₂ | Up to 20% H₂ | Up to 20% H₂ |
| CH Flow Temp Range | 25–80 °C | 25–80 °C | 25–80 °C |
| Max System Pressure | 3 bar | 3 bar | 3 bar |
| Electrical Supply | 230 V / 50 Hz | 230 V / 50 Hz | 230 V / 50 Hz |
| Dimensions (H × W × D) | 700 × 344 × 285 mm | 700 × 344 × 285 mm | 700 × 344 × 285 mm |
| Noise Level | 49 dB | 52 dB | – |
| Included Filter | Adey Micro2 | Adey Micro2 | Adey Micro2 |
| Controls Compatibility | OpenTherm; Baxi uSense (optional) | OpenTherm; Baxi uSense (optional) | OpenTherm; Baxi uSense (optional) |
| Cylinder Compatibility | Baxi cylinders; Megaflo Eco | Baxi cylinders; Megaflo Eco | Baxi cylinders; Megaflo Eco |
| Warranty | 10 years P&L (Adey filter must be registered simultaneously) | 10 years P&L (Adey filter must be registered simultaneously) | 10 years P&L (Adey filter must be registered simultaneously) |
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Baxi 800 System 2 is a premium wall-hung condensing gas system boiler offered in three outputs — 18 kW (818), 24 kW (824), and 30 kW (830) — giving every installer the right size for every job. Compared to the 600 series, the 800 System 2 steps up to a class-leading 10-year parts and labour warranty and includes a factory-supplied Adey MagnaClean Micro2 magnetic system filter in the box, keeping sludge and magnetite out of the heat exchanger from day one. A stainless steel heat exchanger, brass hydraulic block, ErP A-rating, and 93% seasonal efficiency make this an outstanding choice for medium to large homes or any installation where the customer demands maximum peace of mind.
The 10-year parts and labour warranty — compared to 7 years on the 600 series — makes the 800 System 2 the recommended choice whenever the customer prioritises long-term protection. Register at baxi.co.uk/registration within 30 days of installation and ensure annual servicing to keep the warranty fully valid.
Every 800 System 2 ships with a compact Adey MagnaClean Micro2 magnetic system filter in the box. This protects the boiler and heating circuit from magnetic and non-magnetic debris from the outset, reducing breakdowns and maintaining heat exchanger efficiency over the boiler's life.
A stainless steel heat exchanger paired with a robust brass hydraulic block provides excellent corrosion resistance and long-term structural integrity — two of the key factors behind the extended 10-year warranty commitment.
All three models achieve 93% seasonal efficiency with an ErP A-rating for central heating, helping to keep annual gas bills meaningfully below those of older non-condensing boilers while meeting current Building Regulations energy efficiency requirements.
The pre-heated siphonic condensate trap warms and discharges condensate in one go rather than a slow trickle, dramatically reducing the risk of frozen condensate pipes during cold weather and the associated boiler shutdowns and engineer callouts.
All three models can be manually converted between natural gas (G20) and LPG (G31) by a Gas Safe engineer without purchasing an additional accessory kit, making the 800 System 2 suitable for off-grid properties as well as mains gas installations.
Certified OpenTherm modulating control allows the boiler to communicate continuously with compatible thermostats (including Nest and Hive) to vary output rather than switching on and off. The optional Baxi uSense Wi-Fi thermostat adds full smartphone and tablet scheduling.
The built-in EasyFill permanent filling link enables homeowners to top up system pressure without a temporary hose or engineer visit, reducing unnecessary callouts and keeping the heating system operating at correct pressure between annual services.
Despite the premium specification, the 800 System 2 measures just 700 mm H × 344 mm W × 285 mm D and fits comfortably inside a standard 290 mm-deep kitchen or utility cupboard, with all pipework neatly routed behind a built-in stand-off frame.
The 800 System 2 is certified to operate on natural gas blended with up to 20% hydrogen (H₂), future-proofing the installation against planned UK grid decarbonisation changes without requiring any hardware changes.
| Specification | 818 System 2 | 824 System 2 | 830 System 2 |
|---|---|---|---|
| Baxi Part Number (MPN) | 7814313 | 7814314 | 7814315 |
| Heat Output (kW) | 18 kW | 24 kW | 30 kW |
| Boiler Type | Wall-hung condensing gas system boiler | ||
| Seasonal Efficiency | 93% | 93% | 93% |
| ErP Energy Rating | A | A | A |
| Heat Exchanger | Stainless steel | Stainless steel | Stainless steel |
| Hydraulic Block | Brass | Brass | Brass |
| Gas Type | NG (G20) / LPG (G31) | NG (G20) / LPG (G31) | NG (G20) / LPG (G31) |
| Hydrogen Compatibility | Up to 20% H₂ | Up to 20% H₂ | Up to 20% H₂ |
| CH Flow Temp Range | 25–80 °C | 25–80 °C | 25–80 °C |
| Max System Pressure | 3 bar | 3 bar | 3 bar |
| Electrical Supply | 230 V / 50 Hz | 230 V / 50 Hz | 230 V / 50 Hz |
| Dimensions (H × W × D) | 700 × 344 × 285 mm | 700 × 344 × 285 mm | 700 × 344 × 285 mm |
| Noise Level | 49 dB | 52 dB | – |
| Included Filter | Adey Micro2 | Adey Micro2 | Adey Micro2 |
| Controls Compatibility | OpenTherm; Baxi uSense (optional) | OpenTherm; Baxi uSense (optional) | OpenTherm; Baxi uSense (optional) |
| Cylinder Compatibility | Baxi cylinders; Megaflo Eco | Baxi cylinders; Megaflo Eco | Baxi cylinders; Megaflo Eco |
| Warranty | 10 years P&L (Adey filter must be registered simultaneously) | 10 years P&L (Adey filter must be registered simultaneously) | 10 years P&L (Adey filter must be registered simultaneously) |
