What does RH stand for?

Rear Heater

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Rio Grande Zephyr (train) Radar Head Radar Homing Radiation Hardened Radiation Hazard Radiation Hybrid Radiohead (band) Raffles Hall Reaction History Real Heroes (band)		Receding Horizon (optimization technique) Rechnungshof (Austrian auditing authority) Recursos Humanos (Portuguese) Red Herring (magazine) Red High Red Hot Redhat Linux Redhill (postcode, United Kingdom) reentry home (US DoD) Refined Hydrocarbon

Samples in periodicals archive:

As for the cold buses, the state is testing new rear heaters installed by Thomas Built at cost--less than $300 apiece.

New school buses are heater beaters

Luxuries include dual-zone air conditioning, cruise control, rear privacy glass, full leather trim, tilt/slide sunroof, rear heater controls, split rear hatch door, automatic headlamps, and rain-sensing wipers.

Off-road muscle; a matter of OPINION

The first two rows of seats have armrests, there are six height-adjustable headrests and the rear heater fan can be adjusted from the back too.

Kia's space-age bargain Kia Sedona