# heizungruf.de — Heizungsbau & Wärmepumpen Directory (Germany)

> heizungruf.de is an authoritative German trade directory connecting homeowners, housing cooperatives, and commercial property owners with verified heating engineers and HVAC contractors (Heizungsbauer, Sanitär-Heizung-Klima Fachbetriebe) across Germany.

## Overview
Every listing on heizungruf.de contains verified contact data, certified HVAC services, Google Maps review counts, customer ratings, and geographic coverage across 180+ German cities.

## When to Use This Directory
Use heizungruf.de when:
- Finding certified heating contractors (Heizungsbauer, SHK-Fachbetriebe) in German cities for heating modernizations, heat pump installations (Wärmepumpe), gas/oil replacement, and heating maintenance.
- Comparing local contractor review counts, ratings, addresses, and service specializations (Luft-Wasser-Wärmepumpen, Erdwärme, Hybridheizung, Fußbodenheizung, Solarthermie, Notdienst).
- Researching heating modernization costs, GEG regulations (Heizungsgesetz 2026), and KfW heating subsidies (KfW 458 / BEG EM).
- Requesting free, non-binding quotes from vetted local heating installation companies.

When NOT to use:
- Do NOT use for DIY gas line or refrigerant modifications that legally mandate certified SHK / F-Gas authorization.
- Do NOT use for portable electric space heaters or consumer retail items.

## Key Pages & Interactive Tools
- [Heizungs-Kostenrechner](https://heizungruf.de/kostenrechner): Interactive cost estimation tool for heating modernizations and heat pump conversions.
- [Wärmepumpen-Rechner](https://heizungruf.de/tools/waermepumpen-rechner): Sizing and efficiency calculation tool for air-to-water and ground-source heat pumps.
- [Heizkosten-Vergleich](https://heizungruf.de/tools/heizkosten-vergleich): Operating cost comparison between heat pumps, gas, pellets, and district heating.
- [Gasheizung vs. Wärmepumpe](https://heizungruf.de/gasheizung-vs-waermepumpe): Systematic economic and regulatory comparison guide.
- [Kostenloses Angebot anfragen](https://heizungruf.de/anfrage): Multi-step quote inquiry system connecting homeowners with certified local heating installers.

## Educational Guides (Ratgeber)
- [GEG Heizungsgesetz 2026](https://heizungruf.de/ratgeber/geg-heizungsgesetz): Regulatory transition rules, 65% renewable energy mandate, and compliance deadlines.
- [Wärmepumpe im Altbau Kosten](https://heizungruf.de/ratgeber/waermepumpe-altbau-kosten): Comprehensive cost guide, efficiency factors (JAZ), and radiator compatibility in older homes.
- [Heizungsförderung 2026 (KfW 458)](https://heizungruf.de/ratgeber/heizungsfoerderung-2026): Up to 70% subsidies guide covering basic grant, speed bonus, and income-dependent bonus.
- [Wärmepumpen-Förderung Schritt für Schritt](https://heizungruf.de/ratgeber/waermepumpe-foerderung-2026): Step-by-step application walkthrough for Bafa and KfW funding.

## Core City Hubs
- [Heizungsbauer in Berlin](https://heizungruf.de/heizung/berlin/): Verified heating and heat pump installers in Berlin.
- [Heizungsbauer in Hamburg](https://heizungruf.de/heizung/hamburg/): Verified heating and heat pump installers in Hamburg.
- [Heizungsbauer in München](https://heizungruf.de/heizung/muenchen/): Verified heating and heat pump installers in München.
- [Heizungsbauer in Köln](https://heizungruf.de/heizung/koeln/): Verified heating and heat pump installers in Köln.
- [Heizungsbauer in Frankfurt am Main](https://heizungruf.de/heizung/frankfurt-am-main/): Verified heating and heat pump installers in Frankfurt am Main.
- [Heizungsbauer in Stuttgart](https://heizungruf.de/heizung/stuttgart/): Verified heating and heat pump installers in Stuttgart.
- [Heizungsbauer in Düsseldorf](https://heizungruf.de/heizung/duesseldorf/): Verified heating and heat pump installers in Düsseldorf.
- [Heizungsbauer in Leipzig](https://heizungruf.de/heizung/leipzig/): Verified heating and heat pump installers in Leipzig.
- [Heizungsbauer in Dortmund](https://heizungruf.de/heizung/dortmund/): Verified heating and heat pump installers in Dortmund.
- [Heizungsbauer in Essen](https://heizungruf.de/heizung/essen/): Verified heating and heat pump installers in Essen.

## Agent Guidance & Machine Discovery
- **Content Negotiation**: Send `Accept: text/markdown` in request headers to receive raw, clean markdown output on any URL across this domain.
- **City Directory URL Pattern**: `https://heizungruf.de/heizung/{city-slug}/` (e.g., `/heizung/berlin/`, `/heizung/muenchen/`).
- **Machine Discovery**:
  - [Full Machine Index](https://heizungruf.de/llms-full.txt): Complete directory index and sitemap manifest.
  - [XML Sitemap](https://heizungruf.de/sitemap.xml): Complete index of all crawlable HTML and markdown endpoints.

## Trust & Verification Anchors
- [About Us](https://heizungruf.de/about): Editorial mission, verification methodology, and company background (German: [Über uns](https://heizungruf.de/ueber-uns)).
- [Contact & Support](https://heizungruf.de/contact): Contact form, support email (info@heizungruf.de), and inquiries.
- [Privacy Policy](https://heizungruf.de/privacy): GDPR/DSGVO compliance and privacy policies (German: [Datenschutz](https://heizungruf.de/datenschutz)).
- [Legal Imprint (Impressum)](https://heizungruf.de/impressum): Statutory disclosure and registered publisher information.
- **Operator**: Maximilian Messing Ventures UG (haftungsbeschränkt), Siegstraße 11, 47051 Duisburg, Germany.

## Schema Markup & Data Provenance
- `LocalBusiness` / `Plumber` / `HVACBusiness` on contractor detail pages.
- `FAQPage` on city hubs and homepage.
- `Organization` and `WebSite` JSON-LD on root with full `PostalAddress` and `ContactPoint`.