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Professional Gas and Heating Engineering

VitoEnergy carries out comprehensive boiler installations throughout Surrey and Hampshire on all commercial makes and models.  We specialise in Viessmann products and as Viessmann partners can offer extended warranties as well as more in depth tailoring and control strategy.


Whether it is a simple high output, high-efficiency boiler or a large plant room integrated to a multi zone heating system, we always work with the same attention to detail.  


While we are principally commercial gas boiler installers, we also specify and fit combined heat and power units and Hydrogen Fuel Cells.  Combined heat and power gas units and Hydrogen Fuel Cells produce electricity to be used on site and are an excellent way to raise your EPC as a commercial landlord.


VitoEnergy are Viessmann trained installers, we work closely with Viessmann to ensure a consistently exceptional level of design, installation and long term operation.  We are also happy installing and maintaining all other types and brands.


VitoEnergy can work from any level of design, drawings and procurement with in-house installation of commercial boiler installations, we do not use sub-contractors.


VitoEnergy offers world-class water treatment testing, thermal imaging, CAD design, temporary heat solutions and much more.  We have a lot of experience finding the absolute best product for every application, from the smallest 15mm press fitting to full plant rooms, we are constantly assessing our materials and approach to make sure we offer the best service fitting the best equipment.​​​​​​​


Commercial Boiler Services

​​​​​​​Traditionally a boiler is considered commercial or "non-domestic" once it is over 70kw (net) input or if the total gas supply volume is greater than 0.035m3 (or over 35mm diameter).  Many manufacturers may also stipulate that their appliances are commercial if they are under 70kw but designed for that application rather than domestic.  Viessmann, for instance, have a 49kw Vitodens 200 gas boiler, a domestic engineer may feel that their qualifications legally cover them as it is within their 70kw limit however manufacturer instructions override generic legislation in all cases.  Further to the 70kw limit per appliance, it is also the case that if the combined total of gas appliances exceed 70kw then it is no longer a domestic installation.  For any installation where the total input of the gas appliances that share an installation space (room) or which share a wall for flues or even an adjacent wall then the installation is non-domestic. 


So how can a property owner ascertain whether they need a commercial gas engineer? 


Is there a single appliance rated at greater than 70kw net input? 

Is there any gas supply pipe greater than 35mm? 

Does the installation volume exceed 0.035m3? 

Is the combined total of gas appliance input greater than 70kw net input? * 

Are any of the appliances sold as and considered by the manufacturer as Non-domestic? 

Is the gas meter capacity greater than 6m3/h? 


 *(Where the flues are on the same or adjacent wall or where the appliances share an installation space). 


There are many other instances where it should be clear that the installation is commercial, these outline more of the "grey" areas but as you can see it is not uncommon for many private homes to require a commercial gas engineer. 



What makes a commercial heating system or a commercial boiler engineer?  

​​​​​​​Many businesses, schools and charities are taking up commercial gas maintenance service contracts to give added peace of mind.  Service contracts can be a very valuable preventative measure to mitigate the high costs of repair work.  Our service engineers prefer to conduct 6 monthly plant room visits to replace any small components, check the operation of all mechanical parts, safety check and service the boilers and other gas appliances and look at the emitters in the property like radiators or underfloor heating manifolds.​​​​​​​

VitoEnergy commercial service contracts  

​​​​​​​Any new gas supply whether it is domestic or commercial must be purged to each appliance, in domestic this usually entails purging a small volume to each end of the installation.  Commercial testing and purging is required when the installation falls out of scope for a domestic engineer, this requires specialist equipment and further training. 

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Our engineers will test and purge to IGEM/UP/1 and below depending on the requirements and we use our own testing equipment. ​​​​​​​​​​​​​​

Commercial pipe installation, testing and purging​​​​​​​

Commercial Boiler Installation

Boiler installation and replacement accounts for Vitoenergy's main body of work. Its what we specialise in and genuinely enjoy doing. Doing this whilst minimising disruption is a task in its self and gives many factors to engineer around. It's a case of completing the task as quickly as possible but there are many other things to also take into account. Checking the actual load rather than just replacing what was last installed is essential as property generally has much better insulation than when the original appliance was put in, in addition, the load can change due to change of use. Oversizing the unit is a concern as this leads to increased boiler cycling, increased maintenance, loss of efficiency, and unnecessary expense. This isn't to be confused with sizing for back up. For this, however, it is much more sensible to size the appliance accurately and adds a second boiler rather than oversizing 1 boiler to break down.​​​​​​​

commercial boiler service
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