Central Heating Service and Boiler Repair
24 Hours Call Out
Tel: 01462 506051

Competitive Prices

Fast Response

Competent Engineers

Sound Reputation

Gas Safe

I recommend this
company very highly.
They recently installed a
new combi gas boiler in
my property and from
first contact to the end of
the job they were first
rate in every respect:      
A friendly, polite, helpful
and professional attitude.

Andrew, Hemel

Health & Safety

Useful links

Gas engineer James
was very professional
and flexible at the
estimating stage and
carried out the boiler
installation with good
plumbing skills.          
The installation was
thoroughly tested and
proved, and the site was
left in a tidy condition.
Altogether an excellent

Peter, Finchley Road

Power Flush

Unvented Hot Water

There is an increasing demand for unvented hot water storage systems benefits and
advantages they offer.

Unvented hot water systems are connected directly to the mains water supply with
safety devices incorporated into the system to accommodate the higher pressure and
expansion of water. The result being is that all improved flow rates and at balanced
pressures with the cold taps allowing for high performance showers to be fitted without
compromise position due to water delivery.
Unvented systems also use less space due to there being no need for a cold water
storage tank in the loft space which also has the added benefit of no contamination and
no risk of frozen pipes. Unvented hot water systems are quieter than open systems and
have a faster recovery rate of approximately 15 - 20 minutes.  
The only one consideration of an unvented system as with any system is the position of
the cylinder itself to be located as close as possible to the points of where the water is
drawn off. There are a number of manufactures that produce unvented hot water
cylinders in various configurations, size and design although, they all meet part L of the
building regulations. The size of cylinder for a domestic property is normally between
125 Litres and 250 Litres.

Thermal Store

Another type of system that produces mains pressure water after passing through a
storage cylinder - a Thermal Store. These systems are mainly vented systems although
there are unvented options available and work by transferring heat from stored hot
water to mains water passing through the heat exchanger within the cylinder.

Whatever your Hot water requirements are, The Boiler Doctor can carry out a site
survey to ensure that the choice of system is the correct system, we can also repair and
renew cylinders if needed.
SW1 Knightbridge, SW1Chelsea, SW1 South Kensington, SW1 Sloane Square, SW11 Battersea, SW5 Earl's Court, SW3 Chelsea,                              
W10 North Kensigton, W11 Holland Park, W14 West Kensigton, W12 Shepherds,s Bush, SW6 Fulham, SW10 West Brompton, NW3 Finchley Road,
NW8 St.John's Wood, HP3 Hemel Hempstea, SW7 South Kensigton