How to apply for Technischer Planer (m/w/d) Wärmepumpe - Remote - 1KOMMA5° Rostock

About 1KOMMA5°

1KOMMA5° builds the Heartbeat energy software platform, which links solar, battery storage, heat pumps, and charging stations into a virtual power plant. The company also runs a one-stop shop for buying and installing home energy systems. Working here means contributing to CO2-neutral buildings and a decentralized energy supply.

About the role

As a technical planner for heat pumps, you create technical plans for single-family and multi-family homes. You run heating load calculations per DIN EN 12831, size heat pumps, buffer tanks, and heating surfaces, and produce execution documents like schematics and bills of materials. You coordinate with sales, project management, and installation teams and help develop planning standards.

A typical day

A typical day involves running heating load calculations, sizing heat pumps and components, and preparing schematics and material lists. You communicate with sales, project management, and installation teams to align plans. You may also spend time improving planning standards. Ask the hiring team how they structure remote collaboration and daily coordination.

Who 1KOMMA5° is looking for

• Completed training or degree in building technology, HVAC, supply engineering, or a related field
• Experience with heat load calculations according to DIN EN 12831
• Ability to size heat pumps, buffer storage, and heating surfaces for residential buildings
• Comfortable working remotely and coordinating with sales, project management, and installation teams

Tips for this application

• State your experience with DIN EN 12831 heating load calculations directly in your CV or cover letter, since this is a core task.
• List any heat pump planning projects you have done, including building types (single-family or multi-family).
• Mention specific software or tools you use for technical planning, schematics, and bills of materials.
• Explain how you have worked with sales or installation teams before, because this role requires coordination across departments.
• Confirm you can work remotely and are based in or willing to align with the Rostock team's time zone.

What to cover in your cover letter

Highlight your hands-on experience with heat pump planning and DIN EN 12831 calculations. Describe a project where you sized heat pumps, buffer tanks, or heating surfaces and produced execution documents. Show that you can coordinate with sales, project management, and installation teams. Mention any interest in improving planning standards or working with software-driven energy systems.

Research before applying

• Read about the Heartbeat software platform and how it connects heat pumps, solar, storage, and charging stations.
• Look up 1KOMMA5°'s one-stop shop model for home energy systems and installation.
• Check the company's locations and specifically the Rostock team to understand the regional context.
• Review DIN EN 12831 basics if you need a refresher, since it is named in the job description.

Likely interview topics

Based on the job description, expect questions about:

• Walk through a heat load calculation you performed according to DIN EN 12831.
• How do you size a heat pump and buffer tank for a single-family house versus a multi-family building?
• Describe a time you coordinated with sales or installation teams on a technical plan.
• What schematics, bills of materials, or material lists have you created for heat pump projects?
• How would you contribute to developing 1KOMMA5°'s planning standards?

Common mistakes to avoid

• Applying without mentioning DIN EN 12831 or heat load calculation experience, which is a listed requirement.
• Ignoring the coordination aspect of the role and focusing only on technical drawing skills.
• Not addressing remote work, since the position is remote and requires coordination with a local team.