Trade of steam, hot water and cooled air companies in Mannheim

Mannheim ·Currently listed companies in the Trade of steam, hot water and cooled air industry headquartered in Mannheim.

58 companies · 1–20 of 58

Alegria Isolierung GmbH GmbH · HRB 751741 Mannheim · 2024
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BEKER TECHNOLOGIES UG (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 751825 Mannheim · 2024
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blue-oak GmbH GmbH · HRB 731977 Mannheim · 2018
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Büro für Gastechnik Gesellschaft mit beschränkter Haftung GmbH · HRB 1737 Mannheim · 1974
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CARBO Kohlensäurewerke Vertriebsregion Süd GmbH GmbH · HRB 1733 Mannheim · 1974
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Coolman GmbH & Co. KG Klima- und Kältetechnik GmbH & Co. KG · HRA 706315 Mannheim · 2015
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Coolman Kälte-, Klima- und Lüftungstechnik GmbH GmbH · HRB 733523 Mannheim · 2019
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Fernwärme Rhein-Neckar GmbH GmbH · HRB 4045 Mannheim · 1985
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GBT Brandschutztechnik GmbH GmbH · HRB 713477 Mannheim · 2011
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GER MON GmbH GmbH · HRB 712858 Mannheim · 2011
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Green Energy UG (haftungsbeschränkt) UG (haftungsbeschränkt) · HRB 733978 Mannheim · 2019
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Grosskraftwerk Mannheim Aktiengesellschaft AG · HRB 527 Mannheim · 1921
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H & S Energy GmbH & Co. KG GmbH & Co. KG · HRA 708638 Mannheim · 2019
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h-o-t-phone GmbH GmbH · HRB 9766 Mannheim · 2003
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Heat Manager Beteiligungs GmbH & Co. KG GmbH & Co. KG · HRA 707866 Mannheim · 2017
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Irama GmbH GmbH · HRB 731347 Mannheim · 2018
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ISS Kälte- und Klimatechnik GmbH GmbH · HRB 729654 Mannheim · 2018
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ISS-International Supply and Service GmbH GmbH · HRB 718789 Mannheim · 2014
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isteam GmbH Ingenieurleistungen für solare und thermische Energieanlagen Mannheim GmbH · HRB 720428 Mannheim · 2014
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IWT GmbH GmbH · HRB 716743 Mannheim · 2013
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All industries in Mannheim

Live API

GEThandelsregister.ai/api/v1/search-organizations

?limit=20

&filters={"city":"Mannheim","industry_code":"35.30.3","industry_scheme":"WZ2025"}

# pip install handelsregister
from handelsregister import Handelsregister

client = Handelsregister(api_key="YOUR_API_KEY")  # or set HANDELSREGISTER_API_KEY
page = client.search_organizations(
    filters={
        "city": "Mannheim",
        "industry_code": "35.30.3",
        "industry_scheme": "WZ2025"
    },
    limit=20,
    skip=0,
)
print(page["total"])
for item in page["results"]:
    print(item["name"], item["registration"]["register_number"])

// npm install handelsregister
import { Handelsregister } from 'handelsregister';

const client = new Handelsregister('YOUR_API_KEY'); // or set HANDELSREGISTER_API_KEY
const page = await client.searchOrganizations({
  filters: {
      "city": "Mannheim",
      "industry_code": "35.30.3",
      "industry_scheme": "WZ2025"
  },
  limit: 20,
  skip: 0,
});
console.log(page.total);
for (const item of page.results) {
  console.log(item.name, item.registration.register_number);
}

// npm install handelsregister
const { Handelsregister } = require('handelsregister');

const client = new Handelsregister(process.env.HANDELSREGISTER_API_KEY);
(async () => {
  const page = await client.searchOrganizations({
    filters: {
        "city": "Mannheim",
        "industry_code": "35.30.3",
        "industry_scheme": "WZ2025"
    },
    limit: 20,
    skip: 0,
  });
  console.log(page.total);
  for (const item of page.results) {
    console.log(item.name, item.registration.register_number);
  }
})();

curl 'https://handelsregister.ai/api/v1/search-organizations?limit=20' \
  -H 'x-api-key: YOUR_API_KEY' \
  -G --data-urlencode 'filters={"city":"Mannheim","industry_code":"35.30.3","industry_scheme":"WZ2025"}'

{
    "results": [
        {
            "entity_id": "<32-char hex>",
            "name": "<string>",
            "registration": {
                "court": "<string>",
                "register_type": "<string>",
                "register_number": "<string>"
            },
            "address": {
                "house_number": "<string>",
                "street": "<string>",
                "postal_code": "<string>",
                "city": "<string>",
                "county": "<string>",
                "state": "<string>",
                "country": "<ISO country>",
                "coordinates": {
                    "latitude": "<float>",
                    "longitude": "<float>"
                }
            },
            "registration_date": "<ISO date>",
            "purpose": "<string>"
        }
    ],
    "total": "<int>",
    "meta": {
        "request_credit_cost": "<int>",
        "credits_remaining": "<int>"
    }
}

results[]

entity_id string

Stable 32-char hex identifier. Pass straight into /fetch-organization as `q`.

name string

Registered company name.

registration object

address object

Postal address with street, house_number, postal_code, city, county, state, country and coordinates (latitude/longitude).

registration_date date

Initial entry into the commercial register (ISO date).

purpose string

Stated business purpose (Unternehmensgegenstand).

top-level

total integer

Total result count for pagination.

meta.request_credit_cost integer

Credits actually charged for this call.

meta.credits_remaining integer

Account credit balance remaining after this call.

Location · Industry · Legal form · Full-text

Filters & master data — via search-organizations

City, industry, legal form, registration date: every argument combinable through the filters parameter. One REST endpoint, every German company.

Location & geo Filter by city, postal code, state and county through city, postal_code, state and county.
Industry (WZ2025) Industry segmentation via the official WZ2025 codes — industry_code combined with industry_scheme.
Legal form GmbH, AG, KG, OHG and more via legal_form_code.
Company size bs_company_size_category – small, medium, large based on balance-sheet totals.
Active status Restrict to active entries or include deleted companies via active.
Registration date Date ranges via registration_date_from and registration_date_to.
Full-text search Free-text query via the q parameter (min. 2 characters).
Pagination skip and limit (up to 30 results per call) for deep lists.
Master data per result entity_id, name, address, registration and registration_date – pass entity_id straight to /fetch-organization.

Run every filter live with an API key. Get an API key →

Code · AI-Agents · No-Code · Workflows

Drops into any stack

The search-organizations API speaks every mainstream client: REST, Python, Node, MCP for AI agents, n8n and webhook platforms.

REST API Simple GET request with the X-API-KEY header and JSON-encoded filters. Python requests, httpx or your favourite library — pass filters via json.dumps. Node.js fetch or axios with URLSearchParams. Works in edge, worker and browser runtimes. MCP Server Directly in Claude, Cursor or any MCP-aware AI client as the search_organizations tool. n8n Pre-built custom node for workflow automation — city, industry and size as filter inputs. Webhook Callable from Zapier, Make or any other webhook platform.

This list in your app

Grab an API key and filter every German company by city, industry, size and more — straight from your application. One REST endpoint, every result.

Get an API key

Filters & master data — via search-organizations

Drops into any stack

This list in your app

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