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Frequently Asked Questions

Back to Oil Boiler FAQs

Do you recommend treatment of the central heating water?

We do recommend the use of suitable water treatment in the form of an inhibitor to the heating water system, in accordance with the water treatment manufacturer's instructions. The concentration level of the water inhibitor should be checked every 12 months or sooner if system content is lost.



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†When installed by a Worcester Bosch Accredited Installer with a Greenstar System Filter. The Greenstar 1000 and Greenstar 2000 guarantee is available as standard to both loyalty scheme members and non-WAI's, when fitted with any brand of system filter. Terms and conditions apply.

*Fuel bill savings based on a gas-heated home in Great Britain, when replacing an old gas boiler with a new A-rated condensing boiler with a programmer, room thermostat and thermostatic radiator controls (TRVs). Savings for Great Britain are based on an electricity price of 24.5 p/kWh and a gas price of 6.29 p/kWh, calculated from a weighted average of projected, current and recent energy price caps. Source: Energy Saving Trust​

Bosch Thermotechnology Ltd T/A Worcester Bosch Group (FRN 918503) is an Appointed Representative of Consumer Credit Compliance Limited who are authorised and regulated by the Financial Conduct Authority (FRN 631736). The permissions of Consumer Credit Compliance Limited as a Principal firm allow Bosch Thermotechnology Ltd T/A Worcester Bosch Group to undertake credit broking. Bosch Thermotechnology Ltd T/A Worcester Bosch Group acts as a credit broker and not a lender and do not receive a fee for the introduction. Worcester Bosch Group will introduce you to a Worcester Accredited Installer who is either directly authorised by the Financial Conduct Authority, or who acts as an Appointed Representative (AR) or Introducer Appointed Representative (IAR) and who either holds or utilises the appropriate permissions of their Principal firm in order to broker the finance agreement. Credit is provided by Novuna Personal Finance, a trading style of Mitsubishi HC Capital UK PLC authorised and regulated by Financial Conduct Authority. Finance options are offered subject to status and credit check which must be completed before commencement of works. A 14 day cooling off period applies to all applications. If cancelled within 14 days, alternative payment of full outstanding balance must be made. Bosch Thermotechnology Ltd, Registered Office Address- Cotswold Way, Warndon, Worcester, WR4 9SW Company registration number in England 1993294. Tel: 0330 123 9559. Email: service.mailbox@uk.bosch.com

**Representative example - 10.9% APR Interest Bearing Credit - Cash price: £2,800, Deposit: £700, Total amount of credit: £2,100, Term: 120 months, 120 Monthly payments: £28.21, APR representative: 10.9%, Fixed rate of interest: 10.9%, Total amount payable: £4,085.20, Total charge for credit: £1,285.20


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