Four oz beers of your choice! This type of boiler should suit all but the largest houses. Mike and i are still in love with our bathrooms — and would recommend avon plumbing without hesitation! Subject to terms and conditions of the dsd. How soon do you require a service? Iso - environmental management. Never grew accustomed to being awakened in the middle of the night by a noisy oil boiler, and he found no joy in receiving a monthly oil bill he now sleeps.