Water hardness in Gelnhausen
9 °dH hard
Tap water in Gelnhausen is hard: 9 °dH (161 mg/L · 9.4 gpg · 16.1 °fH).
Source: Stadtwerke Gelnhausen – Bekanntmachung Härtebereiche (Stand 07/2025) (2025-07) · data checked 2026-11-02
Range across supply zones: 71–464 mg/L.
3 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Gelnhausen (Kernstadt), Roth | 9 | 161 | hard |
| Gelnhausen ehem. Kasernengelände + Housing, Hailer, Meerholz | 24 | 429 | very hard |
| Haitz, Höchst | 4.5 | 80 | moderately hard |
Stadtwerke Gelnhausen's July 2025 notice splits the town into three hardness areas. The Kernstadt and Roth are at 161.1 mg/L CaCO₃, Haitz and Höchst at 80.1 mg/L, and the former barracks site, Hailer and Meerholz at 428.9 mg/L. The headline figure fits only the Kernstadt, so check which area your street falls in.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 9 °dH |
|---|---|
| Utility | Stadtwerke Gelnhausen GmbH |
How Gelnhausen compares
- Tap water in Gelnhausen is 22 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 527 of 809 in Germany (1 = hardest); 35 % of these cities have softer water.
- In Hessen it is number 47 of 73 cities; the regional median is 10.7 °dH.
- Nearest city with clearly softer water: Wächtersbach, 10 km away (5.1 °dH).
- Nearest city with clearly harder water: Altenstadt, 20 km away (18.2 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Gelnhausen
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| LG | H2 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Gelnhausen water hard or soft?
It is hard: 161 mg/L as CaCO₃ (9.4 gpg, 9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Gelnhausen safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
How many grains per gallon is Gelnhausen water?
9.4 gpg, equal to 9 °dH, 16.1 °fH or 161 mg/L calcium carbonate.
What dishwasher salt setting should I use in Gelnhausen?
For 161 mg/L (9 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Gelnhausen?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Stadtwerke Gelnhausen – Bekanntmachung Härtebereiche (Stand 07/2025) (2025-07). Method: computed from supplier's calcium and magnesium. Stadtwerke Gelnhausen – Bekanntmachung Härtebereiche (Stand 07/2025) · Outdated figure? Tell us