02071667835 London Emergency Gas Safe Registered Engineers 24Hour Corgi Specialist

 

We have professional gas plumbers with 15 years experience as well as some other trade's specialists. We cover all areas of Central London (City London), East Central & West Central London, City of London and  Westminster, West End London (West), Northwest London, East London, North London, Enfield, Southwest London, Southeast London, Bromley & Kent, Croydon, Richmond & Twickenham, Uxbridge, Essex and all surrounding areas
 

All these services are there for all customers who live in London and even some customer who are landlords, sub-contractors who live in overseas and all over the world! We have plumbers, gas heating engineers available in all areas of London and for all commercial & domestic customers

 

How Combination Boiler Works - Emergency Boiler Repair,Breakdown Repair Engineers in London

The combination boiler description applies to an indirect combination boiler where the domestic hot water is heated in a secondary calorifier. See below for more about a direct combination boiler. Our projects section also contains lots of information about central heating of all kinds including oil fired.

 

Combination boilers combine the functions of a central heating boiler and an instantaneous multi point water heater. They give priority, in the main, to the supply of domestic hot water (dhw). The combination boiler has all its operating components contained within the casing and is typically designed for use within a sealed central heating system.

 

Installation is made easier by incorporating an expansion vessel, thus eliminating the need for a feed and expansion cistern in the roof space. Like an ordinary boiler it will have a gas fired burner and a heat exchanger. The waterways of both form part of the central heating system. In most of the early designs of combination boiler, hot water from the heat exchanger passes to a diverter valve, which directs the flow to a domestic hot water calorifier or central heating circuit. The calorifier is tightly packed with small copper tubes, through which secondary water flows the moment the hot water draw off is opened. As the water flows it picks up heat from the surrounding primary water in the calorifier. The central heating system is pressurised and needs a relief valve to protect against any build up of pressure in the system.

 

A pressure gauge on the appliance indicates the operating pressure. A by-pass, connected across the primary flow and return, ensures that an adequate flow of water is maintained. This by-pass may, or may not be a built in feature of the appliance.

 

The flue arrangements for combination boilers may be open, room sealed, fan assisted & room sealed, fan assisted open, miniature flue/condensing or se-duct. The primary heating circuit of combination boilers should be pre-commissioned, cleansed and treated with a corrosion protector in the same way as any other heating system. In hard water areas, the secondary domestic hot water should be treated with an in-line scale reducer or water softer (See projects section for info on both of these) This will prevent the build up of limescale on the instantaneous water heater and the accompanying reduction in flow rate and water outlet temperature.

 

With a direct combination boiler the secondary water is heated in one of two ways. The water may pass through pipes which run down the inside, or next to the primary pipes in the heat exchanger, or by passing through a separate heat exchanger which is bolted on top of the main heat exchanger. A direct combination boiler does not need a diverter valve or a secondary calorifier.

 

In a domestic hot water system where the (condensing) boiler is a replacement for an existing storage cylinder system or a conventional boiler, it is essential that all redundant pipework is removed to eliminate "dead legs" which can hold air and cause air locks. These can also cause cold spots and slow burner shut off.

 

Commercial boilers – heating appliances repair, service, installation

 

- Commercial Boiler Room                                                                

- Commercial buderus Boiler Specialist
- Ideal Concord commercial heating engineer                                    

- Emergency Ideal Concord radiator installers
- Commercial Heating Installers                                                        

- 24HR Commercial Oil Boiler
- Commercial Back Boiler                                                                 

- Commercial Boiler Gas Safety Certificate
- Commercial Annual Boiler Services                                                

- 24 Hours Commercial Heating Breakdown

- Commercial Radiant Tube Heater                                                   

- Commercial Plaque Heater

- Commercial Steam Heating Boiler                                                  

- Steam Boiler Breakdown repair


Commercial Wood Fuelled Heating Boilers Repair,Service & Installation

- Commercial Wood Fuelled Heating Boilers                                       

- Biomass Commercial Wood fuelled heating Installation
- Commercial Wood fuelled central heating                                        

- 24 Hour Commercial boiler specialist
- Hamworthy commercial boiler installers                                          

- Hamworthy Water Heater
- Emergency commercial boiler engineers                                         

- Atag Commercial Boiler Installation
- Atag Commercial Boiler Repair                                                      

- Atag Solar system Hot water heating system



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We operate 24Hours a day 7 Days week.

  • Phone: 0207 1667835
  • Mobile: 0783 7880027

Project Any Size

  • Renovation and Maintenance
  • Domestic Property Refurbishments
  • Commercial Property Refurbishments
  • Commercial Gas Heating Install Projects
  • Emergency Trade Repairs Installs 24HRS
     

Irobot  (Washing,cleaning appliances)  - irobot  - Kelvinator   - kelvinator  - Kuppersbusch  (coffer machine, cooking appliances)    - kuppersbusch   - LEC  (fridges)   - lec  - Leisure   (cooking appliances)  -  leisurecp  - LG  (kitchen, laundry appliances)  - lg  - Matsui  (cooking, fridges)  - matsuispares  - Maytag  (fridges, washing, dishwasher)  -  maytag  - Morphy Richards - morphy richards  - Neff   - neff  - New World  (cooking appliances)  - newworld appliances  - Norfrost   (freezers)  - norfrost  - Rangemaster   (cooking appliances) -  rangemaster  - Sanyo   (air-con)  -    - Sharp   (commercial microwave) - sharp  - Siemens  (burner boilers)  - .siemens  - Smeg  (cookers, dishwasher)   -  smeg  - Stoves  (wood burning stoves)  -  stoves online  - Stoves  (ovens, cookers)  - stoves  - Teka   (kitchen appliances, plumbing)  - .teka  - Tricity Bendix  - tricity bendix  - Vestel   (cooking appliances, air-conditioner,heater) - vestel  - Vestfrost  (commercial refrigeratoer,freezers)  - vestfrost   - Whirlpool  (kitchen appliances, cooking appliances)  - whirlpool  - White Knight - white knight  - Zanussi    (fridges, washing appliances)  - zanussi  - WARM UP  underfloor heating    -  warmup  - HEAT MAT underfloor heating   -  heatmat - BEAMA underfoor heating -  beama  -   DEVIREG undefloor heating - devireg  - UPONOR underfloor heating  -   THERMO FLOOR underfloor heating -  hotpoint  - Husky  (coolers)  - husky  - Indesit  -  indesit -  plumbing bath

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Irobot  (Washing,cleaning appliances)  - irobot  - Kelvinator   - kelvinator  - Kuppersbusch  (coffer machine, cooking appliances)    - kuppersbusch   - LEC  (fridges)   - lec  - Leisure   (cooking appliances)  -  leisurecp  - LG  (kitchen, laundry appliances)  - lg  - Matsui  (cooking, fridges)  - matsuispares  - Maytag  (fridges, washing, dishwasher)  -  maytag  - Morphy Richards - morphy richards  - Neff   - neff  - New World  (cooking appliances)  - newworld appliances  - Norfrost   (freezers)  - norfrost  - Rangemaster   (cooking appliances) -  rangemaster  - Sanyo   (air-con)  -    - Sharp   (commercial microwave) - sharp  - Siemens  (burner boilers)  - .siemens  - Smeg  (cookers, dishwasher)   -  smeg  - Stoves  (wood burning stoves)  -  stoves online  - Stoves  (ovens, cookers)  - stoves  - Teka   (kitchen appliances, plumbing)  - .teka  - Tricity Bendix  - tricity bendix  - Vestel   (cooking appliances, air-conditioner,heater) - vestel  - Vestfrost  (commercial refrigeratoer,freezers)  - vestfrost   - Whirlpool  (kitchen appliances, cooking appliances)  - whirlpool  - White Knight - white knight  - Zanussi    (fridges, washing appliances)  - zanussi  - WARM UP  underfloor heating    -  warmup  - HEAT MAT underfloor heating   -  heatmat - BEAMA underfoor heating -  beama  -   DEVIREG undefloor heating - devireg  - UPONOR underfloor heating  -   THERMO FLOOR underfloor heating - carron bathroomtrojan bathsporcheraquarius toto – st. thomas creation saniflorobernthetfordduravit bristancoramcreda showers – cross water triton showersroman showers  -  heritage bathroom - kohler - roca - aqualisa -  shower makers - american standardlasco bath ware - aquaticbath