Old-style valves in bathroom. How to keep children from burn hazard.

[Matt T.]

I've got a young couple living in a SFH built in the 1940s. Many of the walls in the house are masonry, so replacing plumbing is prohibitive. The bathtub has the old style valves—one for hot and one for cold, and there's no limiter on the hot water.

Anyhow, these tenants are having a baby soon and I wonder how I might protect the tenants from accidentally letting the baby get scaulded, and also protect myself from any lawsuites resulitng from scaulding water.

Does anyone have any ideas? Should I just send them a letter, stipulating that the hot water heater be kept low, etc?

I ask because, years ago, a poster here wrote about how, in one of his houses, a grandmother bathing an infant had left the room and the infant/toddler had been able to turn the hot water on. This resulted in significant burns to the child and a lawsuit for the landlord. I don't know how it turned out in the end.

Thanks.