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Choosing the right size combi boiler for your home can be bewildering, and whilst it is advisable to consult a Heating Engineer or Gas Safe Plumber to give you advice on your new boiler selection it is useful to have an idea of what you will need for budgeting. We have given a rough guide below to help you plan and get the right size boiler for your heating system overall at home. Welcome to Viessmann United Kingdom! It looks like you might not be in the UK?
The products and services presented on this page may not be available in your country; find your local Viessmann website below. Viessmann United States. Answer a few questions and find the heating system that's best for you. Find a product, get a quote.
How to Bleed a Raditor. Watch the Video. Product Registration. Find a new boiler. Heating Advice. Homeowners Professionals. How to add a radiator to a combi boiler system. Do I need new radiators? How many radiators can a combi handle? How to add a new radiator How to bleed radiators How do you balance radiators? How to change a radiator valve?
Get your free consultation on a new heating system. Get started. Want to upgrade your gas boiler? Use our product finder tool. Are magnetic filters worth it? Looking for a new heating system? Get your free quote from a local installer Get started. Why is my radiator cold - common problems and how to fix them How to bleed a radiator: 8 steps to save you money What temperature should a condensing boiler be set at? What to do if your boiler pressure is too high Can you install a heat pump in an existing home?
What should I do if my boiler loses pressure? What to do if your boiler pressure is too low No hot water? How to connect a wireless thermostat to your boiler. What is a combi boiler? What is an expansion vessel? Searching for the ideal boiler size to heat your home or property? From working out the best boiler size to heat a specific number of radiators to understanding how much power an Ideal 30kW gas boiler actually provides, our ultimate list of FAQs has all the answers you need.
Our combi models are available from 24 to 40kW; system from 15 to 32kW; and heat only from 12 to? A kilowatt kW is equal to 1, watts and in any situation, is a unit that helps us measure power generated per second. From 12 and 18kW, to 32 and 40kW, these figures show the maximum power the boiler is capable of producing each second. It makes sense that the bigger your home, the larger the size or kW boiler you will need, and the more it will cost to run.
Thankfully, newer models are much more efficient than older boilers, which means that your energy bill will look much healthier. Which boiler is right for your property depends on several factors. The main things you need to consider when calculating the optimal output are the size of your home, the number of bedrooms and how many baths and showers it houses — all of these are key to kWs required. It takes into account all of the considerations listed above and more, including whether you need a combi, system or heat only boiler.
To make your search even simpler, it will suggest models that are a great fit for your needs. For example, adding a conservatory or en-suite bathroom will mean you need a larger boiler for the increased space, radiators or number of taps and showers. It would be easy to assume that the larger the size of a boiler, the better it will be in any situation — the reality is very different though.
If you have the opposite problem and your boiler is too small, you may end up with too little power to heat your home.
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