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Our advice is yes, because Building Regulations require that anyone installing an unvented cylinder should be ‘competent’ to do so, and holding the appropriate certificate is the best way to demonstrate this.
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You may have been on holiday abroad and wondered why the showers are so good. The answer is that in most of the developed world the way hot water systems work is different to those traditionally found in the UK. These systems are run directly from the mains water supply. The good news is that these systems are also available here in the UK from Chaffoteaux & Maury. These systems are known as 'unvented' because they are sealed from the atmosphere.
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An unvented cylinder is a storage water heater runs directly from the mains water supply. These cylinders systems are known as 'unvented' because they are sealed from the atmosphere. They can be heated either directly with an immersion heater or via a indirect thermal coil that is connected to the heating circuit.
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With unvented systems there are no storage tanks in the loft and they are not reliant on booster pumps to give performance showering. They also offer many advantages over the traditional systems beside shower performance:
1. The loft space can be used as an extra room as there is no need for storage tanks and ancillary fittings.
2. Powerful showering with increased choice of fittings such as body jets and hydro-massage units.
3. Balanced, high pressure to all outlets. .
4. Reduced risk of freezing and expensive damage.
5. Drinking water at all outlets, as every cold water tap is fed directly from the mains water supply.
6. Lower insurance premiums due to absence of stored water in loft.
7. No risk of contamination or stagnation, as water is sealed from the atmosphere.
8. Less noise, no ball cock in lot with tank to fill each time hot water is drawn.
9. Average water pressure is from a traditional 'vented' system with a tank in the loft is 0.3 bar (the same as water falling from 10 feet)
10. Average water pressure is from an 'unvented' systems is 3 bar (the same as water falling from 100 feet)
11. Unvented systems are appliance like in their finish, unlike the traditional copper cylinder which generally is covered with foam insulation and therefore best hidden out-of-sight.
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