Baxi 800 Heat Only Gas Boiler - 819 / 825 / 830 (7898832 / 7890711 / 7749868 / 7749869)
The Baxi 800 Heat is a wall-hung condensing gas heat-only (regular) boiler available in three outputs — 19 kW (819), 25 kW (825), and 30 kW (830) — designed for homes with an existing fully pumped open vent or sealed heating system with a separate hot water cylinder and cold water storage tank. All three models carry a 10-year parts and labour warranty, include a factory-supplied Adey MagnaClean Micro2 magnetic system filter, and are rated ErP A at 93% efficiency. A top or rear in-case flue option, lift weights from 17.4 kg (816/825), no requirement for a pump overrun or permanent live, and compatibility with the Megaflo Eco cylinder range make the 800 Heat the professional's choice for straightforward like-for-like replacement of older regular boilers.
All 800 Heat models carry a 10-year parts and labour warranty — significantly longer than the 7-year warranty on the 600 Heat range. Register at baxi.co.uk/registration within 30 days of installation and maintain an annual service to keep full warranty coverage.
Every 800 Heat ships with a compact Adey MagnaClean Micro2 magnetic system filter, protecting the boiler and heating circuit from sludge and magnetite from the very first day of operation.
The 800 Heat does not need a pump overrun or a permanent live electrical connection, simplifying installation and making it a straightforward like-for-like replacement for old standard-efficiency regular boilers without electrical rewiring.
The 800 Heat offers a choice of central top flue or in-case rear flue, giving installers flexibility in routing flue pipework and enabling a neater installation finish when the boiler is located inside a cupboard with a rear wall accessible from outside.
The 800 Heat can be installed on both fully pumped open vent systems (traditional gravity-fed) and sealed systems, making it the most versatile replacement option for existing regular boiler installations.
The 800 Heat is specifically compatible with the market-leading Megaflo Eco unvented hot water cylinder range, enabling installers to upgrade the entire heating and hot water system to high efficiency in a single visit.
All three output models can be manually converted between natural gas (G20) and LPG (G31) by a Gas Safe engineer without a separate conversion kit, making the 800 Heat equally suitable for mains gas and off-grid LPG installations.
The 800 Heat is certified for use on natural gas blended with up to 20% hydrogen (H₂), ensuring the installation remains fully compliant as UK gas grid decarbonisation progresses.
The 800 Heat range is engineered for very quiet operation, making it well-suited to installations in habitable rooms, utility rooms, or anywhere noise levels are a concern.
| Specification | 819 Heat | 825 Heat | 830 Heat |
|---|---|---|---|
| Baxi Part Number (MPN) | 7898832 (NG) / 7890711 (LPG) | 7749868 | 7749869 |
| Heat Output (kW) | 19 kW | 25 kW | 30 kW |
| Boiler Type | Wall-hung condensing gas heat-only (regular) boiler | ||
| Seasonal Efficiency | 93% | 93% | 93% |
| ErP Energy Rating | A | A | A |
| 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 |
| System Type | Open vent or sealed | Open vent or sealed | Open vent or sealed |
| Flue Options | Central top or in-case rear | Central top or in-case rear | Central top or in-case rear |
| Pump Overrun Required | No | No | No |
| Permanent Live Required | No | No | No |
| Included Filter | Adey Micro2 | Adey Micro2 | Adey Micro2 |
| Cylinder Compatibility | Megaflo Eco; Baxi cylinders | Megaflo Eco; Baxi cylinders | Megaflo Eco; Baxi cylinders |
| Electrical Supply | 230 V / 50 Hz | 230 V / 50 Hz | 230 V / 50 Hz |
| Warranty | 10 years P&L | 10 years P&L | 10 years P&L |
Original: $2,459.10
-65%$2,459.10
$860.68More Images
Baxi 800 Heat Only Gas Boiler - 819 / 825 / 830 (7898832 / 7890711 / 7749868 / 7749869)
The Baxi 800 Heat is a wall-hung condensing gas heat-only (regular) boiler available in three outputs — 19 kW (819), 25 kW (825), and 30 kW (830) — designed for homes with an existing fully pumped open vent or sealed heating system with a separate hot water cylinder and cold water storage tank. All three models carry a 10-year parts and labour warranty, include a factory-supplied Adey MagnaClean Micro2 magnetic system filter, and are rated ErP A at 93% efficiency. A top or rear in-case flue option, lift weights from 17.4 kg (816/825), no requirement for a pump overrun or permanent live, and compatibility with the Megaflo Eco cylinder range make the 800 Heat the professional's choice for straightforward like-for-like replacement of older regular boilers.
All 800 Heat models carry a 10-year parts and labour warranty — significantly longer than the 7-year warranty on the 600 Heat range. Register at baxi.co.uk/registration within 30 days of installation and maintain an annual service to keep full warranty coverage.
Every 800 Heat ships with a compact Adey MagnaClean Micro2 magnetic system filter, protecting the boiler and heating circuit from sludge and magnetite from the very first day of operation.
The 800 Heat does not need a pump overrun or a permanent live electrical connection, simplifying installation and making it a straightforward like-for-like replacement for old standard-efficiency regular boilers without electrical rewiring.
The 800 Heat offers a choice of central top flue or in-case rear flue, giving installers flexibility in routing flue pipework and enabling a neater installation finish when the boiler is located inside a cupboard with a rear wall accessible from outside.
The 800 Heat can be installed on both fully pumped open vent systems (traditional gravity-fed) and sealed systems, making it the most versatile replacement option for existing regular boiler installations.
The 800 Heat is specifically compatible with the market-leading Megaflo Eco unvented hot water cylinder range, enabling installers to upgrade the entire heating and hot water system to high efficiency in a single visit.
All three output models can be manually converted between natural gas (G20) and LPG (G31) by a Gas Safe engineer without a separate conversion kit, making the 800 Heat equally suitable for mains gas and off-grid LPG installations.
The 800 Heat is certified for use on natural gas blended with up to 20% hydrogen (H₂), ensuring the installation remains fully compliant as UK gas grid decarbonisation progresses.
The 800 Heat range is engineered for very quiet operation, making it well-suited to installations in habitable rooms, utility rooms, or anywhere noise levels are a concern.
| Specification | 819 Heat | 825 Heat | 830 Heat |
|---|---|---|---|
| Baxi Part Number (MPN) | 7898832 (NG) / 7890711 (LPG) | 7749868 | 7749869 |
| Heat Output (kW) | 19 kW | 25 kW | 30 kW |
| Boiler Type | Wall-hung condensing gas heat-only (regular) boiler | ||
| Seasonal Efficiency | 93% | 93% | 93% |
| ErP Energy Rating | A | A | A |
| 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 |
| System Type | Open vent or sealed | Open vent or sealed | Open vent or sealed |
| Flue Options | Central top or in-case rear | Central top or in-case rear | Central top or in-case rear |
| Pump Overrun Required | No | No | No |
| Permanent Live Required | No | No | No |
| Included Filter | Adey Micro2 | Adey Micro2 | Adey Micro2 |
| Cylinder Compatibility | Megaflo Eco; Baxi cylinders | Megaflo Eco; Baxi cylinders | Megaflo Eco; Baxi cylinders |
| Electrical Supply | 230 V / 50 Hz | 230 V / 50 Hz | 230 V / 50 Hz |
| Warranty | 10 years P&L | 10 years P&L | 10 years P&L |
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Baxi 800 Heat is a wall-hung condensing gas heat-only (regular) boiler available in three outputs — 19 kW (819), 25 kW (825), and 30 kW (830) — designed for homes with an existing fully pumped open vent or sealed heating system with a separate hot water cylinder and cold water storage tank. All three models carry a 10-year parts and labour warranty, include a factory-supplied Adey MagnaClean Micro2 magnetic system filter, and are rated ErP A at 93% efficiency. A top or rear in-case flue option, lift weights from 17.4 kg (816/825), no requirement for a pump overrun or permanent live, and compatibility with the Megaflo Eco cylinder range make the 800 Heat the professional's choice for straightforward like-for-like replacement of older regular boilers.
All 800 Heat models carry a 10-year parts and labour warranty — significantly longer than the 7-year warranty on the 600 Heat range. Register at baxi.co.uk/registration within 30 days of installation and maintain an annual service to keep full warranty coverage.
Every 800 Heat ships with a compact Adey MagnaClean Micro2 magnetic system filter, protecting the boiler and heating circuit from sludge and magnetite from the very first day of operation.
The 800 Heat does not need a pump overrun or a permanent live electrical connection, simplifying installation and making it a straightforward like-for-like replacement for old standard-efficiency regular boilers without electrical rewiring.
The 800 Heat offers a choice of central top flue or in-case rear flue, giving installers flexibility in routing flue pipework and enabling a neater installation finish when the boiler is located inside a cupboard with a rear wall accessible from outside.
The 800 Heat can be installed on both fully pumped open vent systems (traditional gravity-fed) and sealed systems, making it the most versatile replacement option for existing regular boiler installations.
The 800 Heat is specifically compatible with the market-leading Megaflo Eco unvented hot water cylinder range, enabling installers to upgrade the entire heating and hot water system to high efficiency in a single visit.
All three output models can be manually converted between natural gas (G20) and LPG (G31) by a Gas Safe engineer without a separate conversion kit, making the 800 Heat equally suitable for mains gas and off-grid LPG installations.
The 800 Heat is certified for use on natural gas blended with up to 20% hydrogen (H₂), ensuring the installation remains fully compliant as UK gas grid decarbonisation progresses.
The 800 Heat range is engineered for very quiet operation, making it well-suited to installations in habitable rooms, utility rooms, or anywhere noise levels are a concern.
| Specification | 819 Heat | 825 Heat | 830 Heat |
|---|---|---|---|
| Baxi Part Number (MPN) | 7898832 (NG) / 7890711 (LPG) | 7749868 | 7749869 |
| Heat Output (kW) | 19 kW | 25 kW | 30 kW |
| Boiler Type | Wall-hung condensing gas heat-only (regular) boiler | ||
| Seasonal Efficiency | 93% | 93% | 93% |
| ErP Energy Rating | A | A | A |
| 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 |
| System Type | Open vent or sealed | Open vent or sealed | Open vent or sealed |
| Flue Options | Central top or in-case rear | Central top or in-case rear | Central top or in-case rear |
| Pump Overrun Required | No | No | No |
| Permanent Live Required | No | No | No |
| Included Filter | Adey Micro2 | Adey Micro2 | Adey Micro2 |
| Cylinder Compatibility | Megaflo Eco; Baxi cylinders | Megaflo Eco; Baxi cylinders | Megaflo Eco; Baxi cylinders |
| Electrical Supply | 230 V / 50 Hz | 230 V / 50 Hz | 230 V / 50 Hz |
| Warranty | 10 years P&L | 10 years P&L | 10 years P&L |
