What type of boiler is the Glow Worm Ultimate3 25 - regular, system or combi?

The Glow Worm Ultimate3 25 boiler is an option you may wish to consider if you're looking for a heat only boiler for your house or flat.

If your home has more than one bathroom or you have a large family that uses a lot of hot water, a heat only boiler (sometimes called a regular boiler, a conventional boiler or a standard boiler) is likely to be the best option for you. Heat only boilers require both a hot water or immersion cylinder and a cold water tank. Once the water in the cylinder is heated, you can use this hot water throughout the day and it can feed multiple taps and showers at the same time.

This is in contrast to a combi boiler which can only heat a limited amount of water at any one time. This can cause a problem if two or more taps and showers are being used simultaneously as the temperature, pressure and volume to all points will drop.

Heat only boilers allow you to program the times that you wish heat and hot water to be available. However, if you forget to do this and the immersion cylinder is empty, you may have to wait up to an hour before hot water becomes available again.

If your property already has a water tank and cylinder, it will nearly always be cheaper to replace like for like and not choose a different type of boiler. In addition to new pipework, you may need to replace older radiators that may be unable to cope with the higher water pressure delivered by other types of boiler.

Is the Glow Worm Ultimate3 25 heat only boiler suitable for my house or apartment?

It's best to choose a boiler whose size or "output" is right for your property. With boilers, however, size does not mean how big a boiler is, it means how much power it has.

A boiler’s output indicates the amount of power it can use when heating the water which it then sends to your taps and radiators. The higher the output rate, the more water it can heat.

If a boiler’s output is too low, there will be times when your hot water might not be as hot as you want it to be. If it is too high, you’ll likely be paying more than you need to for your gas.

Measured in kilowatts, the Glow Worm Ultimate3 25 heat only's output level is 25 kW, so which types of property would this Glow worm Ultimate3 25 heat only boiler be an appropriate choice for?

Most heating engineers would recommend this Glow worm Ultimate3 25 heat only boiler as a suitable option for medium-sized homes and larger apartments with 10-15 radiators and two bathrooms.

Glow Worm Ultimate3 25 - size in millimetres

The Glow Worm Ultimate3 25 is TBC mm in height, TBC mm in width and TBC mm in depth.

Ultimate3 25 – non-condensing or condensing?

Condensing boilers like the Glow Worm Ultimate3 25 improve energy efficiency and reduce your annual expenditure on gas.

They do this by capturing and recycling the warmth still present in water vapour condensation and flue exhaust gases to, for example, increase the temperature of the colder water returning from your radiators.

Condensing boilers are also much better for the environment because they emit fewer greenhouse gases.

Is the heat only Glow Worm Ultimate3 25 boiler energy efficient?

As more of us are increasingly concerned about climate change, how we heat our homes and its impact on the environment has become an issue of importance to homeowners.

The heating of our homes accounts for 14% of the UK's greenhouse gas emissions. Especially in the big cities, gas boilers are responsible for dangerous levels of nitrogen dioxide emissions.

Will you be helping the environment if you decide to install a Glow Worm Ultimate3 25 heat only in your home? Let’s look at the figures.

All boilers manufactured and installed in the UK are required to have an energy efficiency rating of 92% or above (or a good “A” SEDBUK rating). Before April 2018, when the law changed, the minimum energy efficiency level permissible was 88% (86-90% is a SEDBUK "B" rating and 90%+ is an "A" rating).

A boiler's energy efficiency rating indicates the amount of energy used and wasted during normal operational performance.

Following its assessment, the Glow Worm Ultimate3 25 was given an efficiency rating of 89.6% and a SEDBUK grading of "B".

If the Glow Worm Ultimate3 25 breaks down, will I be covered by the warranty?

On the Glow Worm Ultimate3 25, the manufacturer offers a parts and labour warranty of 5 years.