Katsunuma, Koshu, Yamanashi Prefecture
Tenku-no-Yu, Katsunuma Budokyo
A strong day-bath option for vineyard scenery and a natural spring through 12 October 2026. The facility is scheduled to close for renovation from 13 October; do not plan a bath visit until an official reopening date is announced.
Check before bathing
- Opening hours
- Open 08:00–22:00; last admission 21:00. A visit is limited to three hours. Adult admission is ¥840, elementary-school children ¥530; Koshu residents pay ¥450 and ¥300 respectively. The mist sauna is temporarily out of service. Scheduled renovation closure: 13 October 2026 through the end of March 2027; a precise spring reopening date has not been announced.
Spring & water temperature
- Spring-source temperature
- Not published.
- Bathing temperature
- Not published.
- Spring source
- The spring used by Tenku-no-Yu; the current official page does not name the well.
- Spring classification
- Alkaline simple hot spring.
- pH
- 9.5 on the current facility page.
- Flow rate
- 200 tonnes per day on the current facility page; a precise current L/min figure is not published. An older 142 L/min conversion is not promoted as current data.
- Water handling
- The facility confirms natural spring water in its outdoor bath, jacuzzi and reclining bath. A pool-by-pool table for water addition, heating, circulation and disinfection is not published. A '100% source water' claim for guest-room baths is not applied to the public bath.
Bathing indications
No current treatment claim is added.
The public bath is scheduled to close for renovations from 13 October 2026 through the end of March 2027. Tattoos policy and preschool-child rules are not confirmed in current public information.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
