“Hot or Cold” at Laodicea

A common myth regarding Laodicea has to do with Jesus’s statement to the church there, “I wish that you were hot or cold; because you are lukewarm, and neither hot nor cold, I will spit you out of my mouth” (Rev 3:15-16). The misconception is that this figure of speech is based on water supplied to Laodicea from the hot springs at Hierapolis and the cold springs at Colossae.

Example of a misguided graphic implying that Laodicea received its water from Hierapolis and Colossae.

The Romans mastered the construction of aqueducts to bring large amounts of water to cities, but water was never brought to Laodicea from either Hierapolis or Colossae, and here’s why.
Hierapolis Water Was Not Potable. The hot springs at Hierapolis were so saturated with calcium carbonate that they produced a beautiful series of unique travertine pools where they flowed down the hillside below Hierapolis.

A small section of the travertine terraces at the Hierapolis (Pamukkale) hot springs.

Even in the 1st century the waters were valued for their healing powers, but this involved bathing in the waters, not drinking them. Although small amounts of calcium carbonate can act as an antacid, excess amounts can cause hypercalcemia and digestive issues. Also, from a practical perspective, water with this much calcium carbonate would have quickly plugged any aqueduct channel through which it flowed.
There Was No Aqueduct From Hierapolis to Laodicea. If an aqueduct had ever been built from Hierapolis to Laodicea, there would be some evidence of it. Furthermore, it would have been the most impressive Roman aqueduct ever built! The distance from the springs at Hierapolis to Laodicea is approximately 6 miles. Roman aqueduct systems were regularly this long and longer, but not over an open expanse. Aqueducts typically followed the terrain to minimize the work required. If necessary, the channel could cross a canyon on a bridge, or even a plain on a series of arches known as an arcade. The longest known arcade is part of the Zaghouan aqueduct that fed Carthage in North Africa, stretching 6.9 miles. At it’s highest, though, this arcade is only 65 feet tall.

Section of the longest Roman aqueduct arcade, leading to Carthage.

By contrast, a hypothetical aqueduct from Hierapolis to Laodicea would need to cross 6 miles, but at a sustained height of over 330 ft!

Google Earth view of a hypothetical line from the hot springs at Hierapolis to Laodicea, with an elevation profile.

The white travertine pools of Heirapolis/Pamukkale are easily visible from Laodicea on a normal day. This photo shows the view toward Hierapolis from the large theater on the north side of Hierapolis. The travertine terraces of the hot springs at Hierapolis/Pamukkale are visible as a white splotch across the valley. Imagine the magnitude of an aqueduct bridge that would span this distance at eye level!

View of the travertine terraces of the hot springs of Hierapolis, from the north theater of Laodicea. Photo by Todd Bolen, BiblePlaces.

The tallest known Roman aqueduct bridge is the Pont d’Ael, in northern Italy. This bridge carried water 216 ft above the canyon floor, but the bridge is only 198 ft long from end to end, making it taller than it is wide.

Pont d’Ael, the tallest Roman aqueduct bridge, built in northern Italy in 3 BC.

The better known Pont duGard is 899 ft long, and 161 ft tall. It is an impressive bridge, and one of the best preserved Roman aqueduct bridges, but it pales in comparison to the bridge that would have been needed to bring water from Hierapolis to Laodicea. An aqueduct bridge from Hierapolis to Laodicea would have needed to be more than twice this tall, and 35 times as long!

The Pont du Gard was built in the 1st century AD to carry water to the Roman colony of Nemausus.

The Romans sometimes used an inverted siphon to cross valleys, allowing them to use a reduced height bridge system. The problem with this kind of system was that water pressure became an issue as the height increased. In fact, such a system was used at Laodicea to cross the short saddle between the city and the hills to the south, but it was a relatively short and shallow siphon. It was made of large blocks of limestone, each with a hollow center, that were fitted tightly together.

Section of the double siphon that brought water across the final saddle to Laodicea.

Section of the double inverted siphon at Laodicea, as it bends to go down the hill to the south; photo by Todd Bolen.

One of the most impressive inverted siphons known from the Roman world is the one built at Pergamum, where lead pipes were installed (to handle the water pressure) for an inverted siphon that was about 2 miles in length. Of course, the small diameter of similar lead pipes would have clogged very quickly if they had carried the highly mineralized waters of Hierapolis.
There Was No Aqueduct From Colossae to Laodicea. The reasons for this are quite practical. There were good sources of water closer to Laodicea than the streams that fed Colossae, some 9 miles distant. There was no point in building an aqueduct from Colossae to Laodicea when closer water sources were at hand, and in fact there are no traces of any aqueduct from Colossae to Laodicea.
Laodicea’s Water Came From the South. Laodicea’s water supply system has been discovered and traced, and it carried water from the hills to the south, the logical direction. Two springs are known to have been used; the Kara Huseyin Pinari spring, 2.8 miles away, and the larger Baspinar spring, approximately 5 miles away. The portion of the aqueduct system that has been traced at Laodicea is shown in blue on the photo below; it was likely much longer originally. Most of the aqueduct follows the contour of the land, more like a canal, and did not require the construction of any bridge or supporting arches.

Google Earth view of Laodicea and its aqueduct, view to the north.

So if “hot or cold” does not refer to aqueduct water, to what does it refer? Probably the best solution is the view that it refers to drinks served at a meal. In fact, Jesus mentions dining with the Laodiceans later in his letter to them (Rev 3:20). Cyndi Parker suggests that, in the view of the ancients, both hot and cold drinks were considered to have positive medicinal value; by contrast, lukewarm water was considered to induce vomiting (Parker, “The Social and Geographical World of Laodicea,” Lexham Geographic Commentary on Acts Through Revelation, p. 693).
Incidentally, the verb “to spit out” (Gk. emeō, ἐμέω) means to vomit or throw up. It appears only here in the NT (but see also LXX Isa 19:14). Vomiting was often the result of consuming too much alcohol, as illustrated on this drinking cup (kylix).

Attic drinking cup depicting a man vomiting, 5th century BC.

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