Plungers with a flat cup are best suited for sinks those with a funnel or cone extending from bottom of the cup are more effective on toilets. How do you decide which boiler will make a practical and efficient fit with your lifestyle and house? there are three main boiler system types, and this part of the article introduces them and the differences between them they are. You can also send your data as json. If you live in rented accommodation and have a drainage problem you should contact.