|Technical Table||Baxi 615 System 2||Baxi 618 System 2||Baxi 624 System 2|
|Natural gas or LPG||Yes||Yes||Yes|
|Inlet supply pressure (natural gas)||mbar (nominal)||20||20||20|
|Maximum Gas Rate (G20) Qmax||m³ / hr||1.64||1.97||2.61|
|Heat Input CH||kW (max) Gross (QnHs)||15.5||18.6||24.7|
|kW (min) Gross (QnHs)||4.9||4.9||4.9|
|Heat Output CH (non-condensing)||kW (Max) (Pn)||15||18||24|
|kW (Min) (Pn)||4.8||4.8||4.8|
|Heat Output CH (condensing)||kW (Max) (Pnc)||16.3||19.9||26.3|
|kW (Min) (Pnc)||5.2||5.2||5.2|
|Heat Input domestic hot water (DHW)||kW max gross (OnwHs)||N/A||N/A||N/A|
|Heat Output domestic hot water (DHW)||kW max||N/A||N/A||N/A|
|Water heating efficiency class||A||A||A|
|Permanent live required||Yes||Yes||Yes|
|External fuse rating (on connection board)||Amps||F0.5A L250VP||F0.5A L250VP||F0.5A L250VP|
|Integral 'boiler only' frost thermostat||Yes||Yes||Yes|
|Maximum DHW flow rate (Delta T @35'C rise)||l/min||N/A||N/A||N/A|
|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 the CH system||Litres||100||100||100|
|Integral automatic bypass||Yes||Yes||Yes|
|Installer Lift Weight||(kg)||28||29||30|
Looking for an installer near you to advise you on your new heating system? Simply enter your postcode and find a local, trained, Gas Safe registered engineer to give you a free, no-obligation quote on a new boiler, cylinder, service or repair.
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.
If you have cold spots at the top of your radiators, it means that there is trapped air that needs to be removed so your radiators will heat your room efficiently. Follow our simple steps for bleeding your radiators.
If you've noticed that water is dripping from the safety pipe outside or through the tundish on the outside of your cylinder, this is an indication that the air gap in your cylinder needs recharging. Watch our video to find out how you can easily fix this yourself, without calling a heating engineer.
Getting your boiler serviced every year is a bit like getting your car serviced. The law requires that all servicing and gas safety checks are made by a Gas Safe registered engineer and an annual service can make all the difference in reliability, efficiency and household bills. If your boiler is still under warranty, having an annual service is a condition of the warranty. Always ask to see the engineer's Gas Safe ID.Read full FAQ