Posts Tagged: maintain the burner

How does an oil boiler work?

Oil boilers operate in a very similar way to gas boilers as the company καυστήρες Μπότης explain us. The fuel – in this case oil – is ignited in the combustion chamber, and a heat exchanger heats cold water – either from the mains in a combi system or from a cold water tank in a conventional system.

Heated water can be used in radiators, faucets and showers to provide heating and hot water to your home.

An oil boiler should have the same efficiency as a gas boiler. According to building regulations, oil boilers must have an energy class of at least 86% or A +. Condensing oil boilers will usually have an efficiency of 90% or higher.

This is due to the fact that oil boilers use almost all the heat and additional gas generated by the combustion of oil, converting it into additional heating energy, so that there is less waste. In addition, oil is a more efficient fuel than natural gas. This means that you will have good efficiency for each unit of energy.

What is the difference between a gas / oil boiler?

The main difference between a gas boiler and an oil boiler is the way the appliances store their fuel. A gas boiler does not need to store gas because it is connected to the mains, which means it has a constant supply of fuel. Instead, an oil boiler requires a tank to store the oil until needed.

About the oil tank

The oil tank must be located on your property and there are certain installation regulations that must be followed. The base of the tank must be strong enough to withstand the weight of the tank and its contents.

The tank must be supported on solid ground, either concrete or paving slabs at least 42 mm thick, extending at least 300 mm beyond the perimeter of the tank. If the tank is close enough to your home, a firewall should be placed between the tank and your home.

Modern oil tanks are usually made of plastic and are relatively easy to maintain. The tank should be refueled as needed to ensure that you do not run out of oil at any point. For some people the tank only needs to be filled once a year, however for larger homes with more radiators, you may find that the tank needs to be filled a few times each winter.

You need a thermostat

As with a gas heating system, your home should have at least one thermostat that tells you the room temperature, the weather compensation (maybe even smart controls). A thermostat should be placed away from a radiator and away from direct sunlight to provide accurate measurements.


The initial time of the few seconds that the fan blows without the supply of oil is of great importance. Firstly, the fan manages to perform completely after a while and secondly, it cleans the boiler from any dangerous oil fumes.

If after some unsuccessful attempts to turn on the burner the boiler is hot, then the oil sprayed from the injector and because it comes in contact with the hot parts of the boiler evaporates, thus creating a dangerous gas cloud.

When these gases come in contact with the flame an explosion ensues. So there were a lot of explosions because, some people thought it good instead of replacing a damaged electromagnetic oil valve, to remove it.

From the above it appears that the burner does not light up when:

1. There is no power supply to the burner electronics.

2. There is light from a flame or other cause inside the boiler before the electromagnetic oil valve opens.

3. No spark is created because

(a) the transformer is damaged;
(b) the electrodes are damaged or dirty;
(c) they are not placed correctly,
(d) the electronic is damaged.

4. No oil is sprayed because

(a) there is no oil,
(b) the oil electromagnetic has failed;
(c) the injector or oil supply pipe is clogged;
(d) the electronic has broken down;
(e) from other causes (icy oil, water in oil or garbage, etc.).

5. The air is much more than required (poor tamper setting or incorrect diffuser mount).

6. The photocell does not see light after opening the oil valve, because it is probably dirty or damaged or the electronics are to blame. However in this case, if the burner turns on and off then the photocell is probably to blame.
7. The electronics are damaged.

In all the above cases, the electronic blocks the operation of the burner by turning on the reset button on it. To turn on the burner, we have to press this button after a few minutes. If the burner still blocks after two or three resets, we should start looking for which instrument is damaged.

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