Can they work with regular American plumbing?
Here is a link that might be useful: faucet
Looks like they have adapted their products to the USA:
English manufacturer Samuel Heath has launched an American version of its website. Created for interior designers, architects and consumers in the U.S., the company offers faucets, showers, bathroom accessories and architectural hardware.
The company currently has an office in New York, which will be supported by the new online endeavor. The website features a full product catalog, detailing products suitable for American plumbing systems. Users can also find information about retail showrooms that supply Samuel Heath products across North America.
Vanessa Allan, marketing manager at Samuel Heath, said, "American interior designers and consumers make up a very important part of Samuel HeathÃ¢ÂÂs customer base, so weÃ¢ÂÂre really pleased to be able to offer a dedicated online USA showroom directory that should make buying Samuel Heath products easier and more convenient."