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RES  (Gas safe registered NO. 528699, Vaillant specified boiler installer)   carries out a wide range of gas services;

The following are the most popular boiler systems currently used in U.K.

Name Theory Good Bad
Vented Also named Gravity System. Two tanks in the loft. One for Cylinder and the other one for heating system. Simple and easy installation. Open vent and produce sludge quickly.
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Combi No need of tanks/cylinder anymore. Energy efficient. Save space. Boiler is more expensive. Hot water flow rate could be smaller.
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Unvented Hot water stored in cylinder. No oxygen in the system and sludge is difficult to be made. Installation costs more. Cannot be applicable if local water pressure is too low.
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