Commercial Central Heating Repairs Chiltern

Get to know How Combiation Boilers Work

Combination or combi boilers, combine the central heating (CH) with (tankless) domestic hot water (DHW) in one box. They are not merely infinitely continuous water heaters having the ability to heat a hydronic heating system in a large house. When DHW is run off, the combi stops pumping water to the hydronic circuit and diverts all the boiler's power to instantly heating DHW. Some combis have small internal water storage vessels combining the energy of the stored water and the gas or oil burner to give faster DHW at the taps or increase the DHW flowrate.


Combi boilers are rated by the DHW flowrate. The kW ratings for domestic units are 24 kW to 54 kW, giving approximate flowrates of 9 to 23 litres (2.4 to 6.1 US gal) per minute. There are larger commercial units available. High flowrate models will simultaneously supply two showers.


A further advantage is that more than one combi unit may be used to supply separate heating zones, giving greater time and temperature control, and multiple bathrooms. An example is one combi supplying the downstairs heating system and another the upstairs. One unit may supply one bathroom and one another. Having two units gives backup in case one combi is down, provided the 2 systems are connected with valves that are normally closed.


Installation cost is significantly lower and less space is required as water tanks and associated pipes and controls are not required.


Combi boilers are highly popular in Europe, where in some countries market share is 70%.

Combination boilers have disadvantages. The water flow rate is likely to be less than from a storage cylinder, particularly in winter. The power rating needs to be matched to heating requirements; heating water ‘on demand’ improves energy efficiency but limits the volume of water available at any moment. The water supply pressure must not be too low. It has been proposed that a flow regulator valve can control the amount of water used. Additionally, a combination boiler has more moving parts that can break down, so can be less reliable than a tank system.

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Our Heating Experts And Multi-Trades Specialist And Our Team Are More Than Happy To Assist All Kinds Of Commercial And Residential Clients.

  • Landlords, tenants                                                                * Overseas clients in all countries
  • Commercial – domestic Landlord or tenant                     * Clients from Surgeries, clinics, hospitals
  • Clients in cinemas or theatres                                             * Hotel Clints
  • Restaurant Clients                                                                 * Clients in Pub - Cafe
  • Office Clients                                                                          * Supermarket Clients
  • Shopping mall Clients                                                           * Clients in Commercial Buildings
  • Clients in Colleges, universities or schools                       * Clients in Hospital
  • Clients at Clinic,Surgery                                                       * Clients in the Markets
  • Clients who work in all commercial properties               * Clients in the showrooms
  • Clients in the showroom                                                      * Senior Citizen Clients
  • Charity clients                                                                        * Charity Clients
  • Letting agent & Property maintenance customers         * Other Contractors and Trades Clients
  • Customers in museum                                                         * Customers in building sites      
  • Anyone in small, medium,large property                         * Clents who live on the boats
  • Clients who are in Mobile Caravans                                  * Production Factory clients 
  • Clients who are at Airports                                                 * Clients in Factory  

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