Q: Do I need to order a separate flue with the Wallstar?

A: No! To make life easier for installers, we've designed Wallstar complete with its own integral balanced flue. This helps to make the design more compact and means there are no hidden costs for the customer. It's part of our "everything in one box" policy.

Q: I want to install an HRM Wallstar but my outside wall is over 400mm thick. Can I still fit one?

A: You most certainly can! As standard the Wallstar range is designed for walls between 210mm and 340mm thick, however with the addition of a 100mm extension kit, a Wallstar can be installed into a wall with a thickness of up to 440mm.

Q: Do I need a de-aerator (tiger loop)?:

A: Not with Wallstar! We've designed it to work using only a single oil supply pipe from the tank. This saves time and money for installers and saves money for householders.

Q: The oil tank is lower than the boiler, is this a problem?

A: No! The Wallstar & X-ternal will vertically lift the oil approximately 2.5 metres from the outlet of the oil tank.

Q: Are the Wallstar & X-ternal suitable for sealed systems?

A: Yes! Both come with a manual reset high limit thermostat already tested and fitted and the boiler is pressure tested to 3 bar.

Q: Can I run my Wallstar on any type of oil?

A: No! Wallstar's must be run on kerosene (28 second fuel).

Q: I am installing a Wallstar in an unheated garage, will I need to fit a frost thermostat to protect the boiler from freezing?

A: No! Wallstar comes with a frost thermostat already tested and fitted.

Q: Do I need to fit a lintel when installing a Wallstar??

A: No! Wallstar's do not require the use of a lintel to support the opening created in the wall.

Air Issue with your boiler

Air in the oil line can be the most frustrating issue with a burner lock out fault. It need not be though. ​ If you do have an excess of air in the oil line changing the control box, transformer, coil etc will not cure this.

You must find the cause of the air. Changing burner components will not fix an air problem. Please do not fit a Tiger Loop. A Tiger Loop is not needed.

It is a costly exercise that WILL NOT WORK. All you will be gaining is extra joints in the oil line. If the boiler had been working fine prior to the air issue it will work fine after solving the air issue. Air ingress is generally down to 1 of 4 issues. These are...

1. Oil tank out of oil.

If the oil tank has run out of oil the burner will starve itself and lock out. If this happens you must first clean the filters in the oil line from tank to boiler. When the oil is being delivered turn the boiler off (whether you are out of oil or not).

Once the oil has been delivered you must let it settle in the tank for an hour otherwise the oil line will drag debris from the tank to the burner. You can now fire the boiler and pull the oil from the tank to the burner and then to the nozzle.

Once the oil is at the nozzle you will have to replace this with a new one. The air would have damaged the end of the existing nozzle. If the nozzle is not changed you may see your boiler blowing out black smoke from the flue..

2. Faulty fire valve

The wheel head fire valve can cause issues with air if faulty. If you need to replace this part we recommend that you loosen off the fittings prior to install and submerge the fire valve in a pot of kerosene to lubricate all internal parts.

The wheel head 'T' section of the fire valve can dry out if it has been sitting on a shelf for a period of time prior to install.

3. Loose fittings

Loose fittings can be an issue. From the oil tank to the burner there should be the minimum amount of fittings used. If fittings in this oil run are changed they must be replaced using a liquid compound and the new joints must be extremely tight. If a taped joint is used this can let air into the oil line.

4. Blocked or dirty filters

During the annual service of the boiler the filters need to be cleaned, or changed if damaged. If your filters are blocked this will restrict the oil supply to the burner. If the oil is stifled by blocked/dirty filters the burner will still try to pull but will only generate air flow through the oil line.

Once this gets to the burner it will lock out and you will notice a very large air break in the clear oil line. Once filters have be cleaned or changed it is very important that the connections are very tight. Loose connections will still continue to let air into the line.