What Is It?
This boiler is the most simple and so the most reliable boiler, but it does have a few downsides. A combi boiler put the whole set of valves and components of older systems into one box, which is a combi boiler. A heat-only boiler still has most things external to it.
Drawbacks
It is almost identical to the system boiler except it does not have mains pressured hot water. Tanks are usually fitted in the attic, they supply water to the hot water tank and radiators.
Another drawback is the cylinder is normally copper. These are expensive and do not last as long as steel cylinders. If the hot water runs slowly, it may be necessary to fit pumps to the showers etc.
This may be the simplest boiler, but nearly all the parts and problems are external to it. External parts are not under the same warranty or servicing. The hot water from the taps is often lower. While being a condensing boiler, it has less control over the system. This lowers the actual efficiency of the heating system in most cases.
Low Pressure And Rural Homes
Often if the pressure is low, as it can be in rural or properties on hills, this is the best system. There are options to increase the hot water to taps and it can supply more than one bathroom easily.
Do Heat Only Boilers Condense?
All boilers made in the last 15 years are condensing. This system often has cheaper maintenance and repairs.
Summary
One final consideration is that replacing a heat-only boiler is usually cheaper. Converting the system to a system boiler or combi boiler can be much more costly.
Replacing the boiler is a good time to change any existing external heating parts. This will offer a saving of future costs and ensuring years of efficient service.
