This will be useful someday i never knew the pepsi method, will have to try that out if and when my drain gets clogged in the future! An annual boiler service worth £. Whether you’re replacing the unit you have or upgrading your home with a new hvac accessory, we can help. Please drop us a line below and we'll get in touch with you shortly! Only registered users can write reviews please. Call us with confidence! we are fully.