Boiler Change: 5 things to know

Boiler Change: 5 things to knowPictured: white wall boilers Thema Classic installed in a kitchen between two high furniture.

Leroy Merlin

It is time to replace the boiler. The announcement rarely triggers enthusiasm! It must be said that the expenditure is consistent and it is not easy to choose among the different types of boiler: wood, gas, heat pumps, condensation, etc. How to make the right choice ? Change the boiler is also question its energy choices. And if we opted for a cheaper and cleaner energy? With all these questions, we went to meet a man of field. Its role is to support individuals and professionals in their energy projects. An expert boilers!

Change boiler, yes, but what material to choose? How to optimize the investment? What mistakes should we avoid at all costs? Take the opinion of Jean-Christophe Le Beux, charge d'affaires, in West Heating specialist coverage Energy in Nantes. A true pro in energy efficiency, he advises clients on the best solutions and the right thing to spend less.  

1. At what point should I replace a boiler?

Jean-Christophe Le Beux : as for your appliances, it is difficult to predict the end of life of a boiler, some take more than 10 years, others only 7 or 8. The best is yet to anticipate, to quietly study several solutions and specifications.  

Some signs alert you on your boiler state of fatigue: suspicious noises, an inexplicable increase in energy consumption, blackouts. If it also produces hot water, the water temperature drop is a sign that does not deceive.  

Without waiting for these signs of weakness, if your boiler is more than 15 years, you have to question you. It was 15 years ago, the condensing boiler does not exist. Now, this technology saves 15 to 20% energy. Do the math with regard to your use, you may have interest in moving now to condensation. 

To remember : Condensing boilers provide real energy savings (between 15 and 20%) and are eligible to ISCED (Tax credit for the energy transition). 

2. If I replace my boiler needs to change energy and where to turn?

Jean-Christophe Le Beux : Energy choices is a big question that is studied case by case. Some customers look at the price "official" kWh of heating energy type (published by the Ministry of Sustainable Development). They multiply that price by its annual consumption and thus compare the wood, gas, heat pumps, etc. 

But this can not be the only criterion of choice: investment, the cost of the subscription, maintenance, comfort and environmental impact are also taken into account. Furthermore, nobody knows how to evolve the respective energy prices. 

For example, the price per kWh of heating with wood pellets is among the lowest. However, the cost for installation is very high, the wood boiler takes much more space than a conventional boiler wall and you have a storage space for pellets.  

Reflection is quite identical to the heat pump. That is, to use a mode of heating very economical, but you'll have to pay at least 14,000 euros to install and each year you will pay maintenance, so the more complex more expensive than a conventional boiler . It all depends on your priorities and your budget.  

To remember : all energies have their advantages and disadvantages. Your budget is a determining factor. 

3. I chose energy but what is the best boiler?

Jean-Christophe Le Beux : There are excellent boilers in all price ranges, regardless of the technology. Trust your heating engineer, he has every incentive to meet you for the positive word of mouth is the best advertising. 

Tip: always think furnace + regulation. This is the pilot installation that makes you money because you only consume what you need.  

Install such a room sensor in the house and an outdoor sensor (if in house). These devices will engage with the internal regulator to the boiler to adjust the output according to pre-defined temperature criteria.  

We now uses radio kits, wireless, simple to implement. The heating is responsible to set the settings during commissioning. 

If you have radiators, equip the thermostatic heads for finer adjustment, piece by piece. 

To remember : think thermostats and control systems, they will save you money to use. 

4. Do I keep my old radiators?

Jean-Christophe Le Beux: in general, so, the new boiler will be adapted to the existing configuration radiators or underfloor heating. If your choice fell on a heat pump (CAP), you will either have a high temperature CAP (if you have radiators) or low temperature (for your floor heating). But what we must absolutely do is enjoy the boiler replacement to clean the circuit, flush radiators and thermostatic heads or change désembouer floor heating. If you do not do this, you do not enjoy full performance of your new boiler. Indeed, some boiler manufacturers deny the warranty if the circuit is not cleaned. 

To remember : to enjoy the performance of the new boiler, a complete cleaning of the circuit is required.  

5. How to make the most of my new system?

Jean-Christophe Le Beux : A board sense: make sure the house is well insulated. Sometimes it is better to delay a year or two the change of boiler and invest in roof insulation or replacing windows. If you put a new boiler in an uninsulated house, you will not see any positive impact on your bills. 

Another tip: do not neglect the maintenance of your heating system, throughout his life. Do not just maintain the boiler, but the circuit by a professional.  

To remember : energy efficiency is a global issue. To spend less energy, so make sure the insulation of the house, windows and shutters, ventilation.  

A boiler change is eligible for aid: energy transition tax credit (IETC) and premium energy. Make sure your hardware is eligible and your installer is called "EGR".  

To close this file, here are some indicative prices (including VAT) for the supply and installation of boilers, for a house of 120 m2 (these prices do not include the casing)  

  • heat pump: about 13 500 euros
  • boiler wood pellet: approximately 12 500
  • gas condensing boiler: about 6 000
  • boiler low temperature gas: about 4,500 euros (do not entitle the ISCED)
  • radio control kit: 250 Euros
  • thermostatic head: about 35 euros
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