Conventional Condensing Boiler

Condensing Combination Boiler

Normally a conventional boiler system has two water tanks in the loft, a large 'cold water storage tank' and a small 'feed and expansion tank'. The 'cold water storage tank' draws water from the cold water mains to refill.

Water from the storage tank feeds cold water down to the cylinder (normally in the airing cupboard and sometimes referred to as the hot water tank).

The condensing central heating boiler will heat the water in the cylinder, this then enables the cylinder to release gallons of hot water to taps throughout the house.

A pump will circulate central heating  water via the pipes and in turn, heat the radiators.

So, what are the benefits to me?

  • Instant hot water-but limited.
  • High volume and flow of water at the taps.
  • Multiple tap operation at any one time.
  • Use of an airing cupboard.
  • Backup electric hot water heating available (Immersion).
  • Heating and hot water together.
  • Compatible with solar.

And what are the disadvantages?

  • More space required.
  • Tanks taking up space in the loft.
  • Time required for cylinder to heat.
  • Limited amount of hot water (determined by the size of the cylinder)