Manufactured in the UK, the Baxi 800 Combi 2 has a 10-year parts and labour warranty*.
Due to the compact fit, the boiler can be installed neatly in a convenient safe place in your home. It’s compatible with the Baxi uSense smart control, when paired with our My Baxi App you can operate it wherever you are, using your phone or tablet.
Find an installer*Terms and conditions apply
10-year parts and labour warranty* for complete peace of mind
Includes an Adey Micro 2 Filter** to protect your heating system and boiler
EasyFill makes it easy to top up the central heating system pressure without having to call an engineer
Pre-heated condensate trap to prevent freezing in winter – less risk of frozen condensate pipes
Works with natural gas or LPG, without a conversion kit
*Terms and conditions apply
**The Adey Micro 2 Filter must be installed and registered at the same time as your boiler for your 10-year warranty to be valid
| Baxi 824 Combi 2 | Baxi 830 Combi 2 | Baxi 836 Combi 2 | ||
| Sales Code | Boiler Only | 7814304 | 7814305 | 7814306 |
| Gas | ||||
| Natural gas or LPG | Yes | Yes | Yes | |
| Inlet supply pressure (natural gas) | mbar (nominal) | 20 | 20 | 20 |
| Maximum Gas Rate (G20) Qmax | m3/hr | 2.61 | 3.26 | 3.9 |
| Heat input CH | kW (max) Gross (QnHs) | 20.6 | 25.7 | 25.7 |
| kW (min) Gross (QnHs) | 4.9 | 6.0 | 7.2 | |
| Heat Output CH (non-condensing) | kW (Max) (Pn) | 20 | 25 | 25 |
| kW (Min) (Pn) | 4.8 | 5.8 | 7.2 | |
| Heat Output CH (condensing) | kW (Max) (Pnc) | 21.8 | 27.1 | 27.1 |
| kW (Min) (Pnc) | 5.2 | 6.3 | 7.6 | |
| Heat Input Domestic Hot Water (DHW) | kW max gross (QnwHs) | 27.4 | 30.9 | 36.9 |
| Heat Output Domestic Hot Water (DHW) | kW max | 24 | 30 | 36 |
| Water Heating Efficiency class | A | A | A | |
| Electrical | ||||
| Permanent Live Required | Yes | Yes | Yes | |
| External fuse rating | Amps | 3 | 3 | 3 |
| Pump Overrun | Yes | Yes | Yes | |
| Integral 'boiler only' Frost Thermostat | Yes | Yes | Yes | |
| Hydraulic | ||||
| Maximum DHW flow rate (Delta T @ 35'C rise) | l/min | 10.2 | 12.2 | 15.0 |
| Minimum DHW flow rate required | l/min | 2 | 2 | 2 |
| Minimum Operating DHW pressure required | bar | 0.5 | 0.5 | 0.5 |
| Integral Expansion Vessel | Size (litres) | 7 | 7 | 7 |
| Maximum Capacity of CH System | Litres | 100 | 100 | 100 |
| Integral Automatic Bypass | Yes | Yes | Yes | |
| Weights | ||||
| Installer Lift Weight (boiler) | (kg) | 29.2 | 29.2 | 30.5 |
If you are upgrading your heating system, have you considered installing an air source heat pump? Right now, you could be eligible for a grant of £5,000 to help with the installation cost.
Find out more
Did you know we have a dedicated homeowner Facebook page, full of hints and tips, fun information and inspiration.
If you are troubleshooting a Baxi boiler with a dedicated reset button:
We all want to stay cosy in the winter. Some cosier than others. There’s no magic number for the ideal temperature. If you’re looking for a good balance of warmth and efficiency, you want to set your boiler to at least 65°C. Setting it a few degrees higher won’t hurt. But it’s important not to set it any lower than that. This is so bacteria in the water doesn’t grow, and cause nasty things like Legionella.
Read full FAQIt is quite simple to top up the water pressure in your boiler. You should be able to do it yourself without having to call a heating engineer. We have made some videos below to help you.
Read full FAQYou can find out how old your boiler is by visiting the official industry database.
Fill in details of your boiler and the dates when manufacture of that model began and ended will be displayed.
Read full FAQHere, we explain the best way to bleed your radiators.
