After a long period of work on our data architecture, we’ve achieved something we’ve been aiming for - finding the right balance between performance, cost, and scalability.

Effective immediately, data retention has been extended from 3 months to up to 3 years. Thanks to the new infrastructure and advanced data compression, we can store significantly more data without compromising application performance.

Importantly, this change is available to all users at no additional cost and without any increase in subscription pricing.

Due to previous backup policies, we have currently restored historical data for the last 11 months. Older data is not available, but from now on the system will continuously build up history to the full 3-year retention window.

In practice, this unlocks much deeper analysis - you can now compare your heat pump performance not only with the last winter season, but also with the two previous years.

We will continue to monitor the new solution in terms of performance and stability, but initial tests indicate that maintaining the full 3-year retention period should not require any reduction.

Example public report from 23rd May 2025:

Additionally: UI update

We’ve refreshed the login and registration pages - cleaner, more modern, and easier to use.

Anti-Cycle Mechanism for Online Curve mode

Works with both WiFi Adapters and MelCloud integrations.

For WiFi adapters, it operates even when the heat pump is offline.

If the heating curve is not properly adjusted to outdoor temperatures, the mechanism keeps the compressor running longer to reduce cycling. Especially useful during spring and autumn due to warmer days.

Examples of a wrongly configured heating curve before and after anti-cycling changes are shown in the first image.

🆕 New clean homepage layout including new sections:

and more

• New integration via PlanetDevices

Adds support for over 20 heat pump brands supported by PlanetDevices. Currently in beta, more details coming soon.

• New elements in the installer panel

Added tiles with quick overview of fleet data, alerts for pumps that require attention, and benchmarking of heat pumps within the fleet.

• Detailed data page

A new tab in the installer panel showing all raw data available from a given integration. Please note that this data is not processed, and its interpretation depends on the specific installation.

• Live report in the installer panel

Displays all integration data from the moment it is opened, updated every 30 seconds.

For the Wifi Adapter, it reflects near real-time pump status.

For cloud API integrations, there may be a slight delay, typically up to one minute.

• Fixes for Smart Energy and Solar Mode

Resolved an issue where the system did not return to the original room temperature when one mode transitioned directly into another without a transition period.

• Improvements to online curve

With higher spring temperatures, more pumps started short cycling.

We are testing protections to reduce short cycling.

The application or adapter detects when the compressor is approaching shutdown and slightly adjusts settings to extend its operation.

After shutdown, it prevents rapid restart to minimize cycling.

This mechanism is continuously developed and monitored to ensure compatibility across different pump types.

• Updated tooltip view in detailed report (mobile)

The tooltip is now anchored to the bottom of the screen so it does not cover the chart.

Let us know if this should also be applied to other charts.

• Fixes for Swedish translations

• Other minor fixes and UI improvements

Thank you for using MelPump and for all your feedback

We have introduced a beta feature that estimates energy consumption and production for devices without built-in meters. Using data like flow temperature and compressor frequency, the app now provides an approximate COP. Please note these are estimations; a disclaimer will appear on your dashboard if your data isn't coming directly from a meter.

Our development focus has shifted heavily toward major integrations. We are currently working on MELCloud Home and adding support for manufacturers like Daikin, Panasonic, Samsung, Midea, Kaisai and more via the Planet Devices (Modbus) adapter.

Because these integrations are resource-intensive, you may notice a temporary slowdown in smaller app fixes and user-requested tweaks. We appreciate your patience as we prioritize these core compatibility updates.

The update also includes various minor stability improvements and app optimizations.

We’ve just published a comprehensive guide for new heat pump users and owners (not only Mitsubishi).

Check it out here:

At the bottom of the page you’ll also find a full list of all parameters available in the app, along with descriptions.

*This is a basic introduction to help you understand what a heat pump is and how to read the graphs, it’s not intended for advanced users.

Other updates:

* Minor improvements and bug fixes

* We’ve started working on integration with custom planetdevices.com hardware, as the first step toward supporting heat pumps from other manufacturers (Daikin, Midea, Kaisai, Panasonic, and more)

* We’ve continue working on MelCloud Home integration, but the features would be very limited, because we received an answer that they will not add any another data to their API responses (there won't be data like compressor frequency, outdoor temperature, booster heaters or defrost, but we will try to figure something out)

From now on, every user can choose which temperatures are displayed across all reports, and separately select the key temperatures shown on the dashboard.

A new section has been added to the Configuration tab, where you can select the temperatures you want to track for your heat pump. By default, temperatures load exactly as before, depending on whether you use two zones, DHW sensors, or a ground source heat pump. Once you change any temperature settings, they are saved permanently until you click the “Restore defaults” button. Additionally, after clicking the “Learn More” button under each temperature, a detailed description of the sensor and its meaning will be displayed.

When a temperature is disabled in the configuration, it will disappear from all reports except shared detailed reports. These will always include all available temperature data, as they are typically used to get help from the community, and it would be inconvenient to require users to temporarily re-enable all data series.

Due to these changes, some reports have been redesigned:

The dashboard temperature report no longer includes buttons for selecting the last day or week. Instead, it now uses a date picker calendar, consistent with other dashboard reports, and is fully synchronized. Changing the date anywhere on the dashboard updates all reports. The “Export” button has also been removed, as this data can be exported from the “Temperature Report” section.

The daily temperature report in the “Temperature Report” section now loads average values for the selected day by default instead of all raw data. Data is grouped hourly, as full-day averages did not provide realistic values when analyzing heat pump operation to optimize settings.

New temperature series have been added: buffer temperature, supply and return temperature of an additional heat source. To display them on charts, they must be enabled in the configuration. Please note that most heat pumps do not have these sensors. If you see a constant value of 25°C, it means the sensor is not active.

This is one of the larger updates, involving a major rebuild of most reports. If you encounter any issues, please report them via email at support@melpump.com

Still in beta, we are open to suggestions on what should be added.

We’ve rolled out several application updates over the last few days, focused on usability improvements and reporting enhancements:

• Fixes to the online curve mode

• Added a “place” field for installer accounts to better identify heat pumps from the MELCloud Building List

• Last selected filters are now saved in the energy comparison report

• Added brine inlet and brine outlet temperature data to detailed reports for Geodan heat pumps with Wi-Fi adapters

• Improved device selection for accounts with more than 5 devices – now with a searchable select box showing device name, place name, and an AC tag for air conditioners (currently available in the web app)

Online Curve Mode automatically adjusts your heat pump's flow temperature based on real-time outdoor conditions. You can adjust online curve directly from the application.

Key Features:

✅ Based on the Constant Flow mode – Flow temperature adapts automatically to outdoor temperature changes

✅ Manual Correction – Fine-tune the entire curve by ±10°C to match your comfort preferences

✅ Wind Correction – Compensates for heat loss during windy conditions with 4 correction levels

✅ Easy Curve Configuration – Add or remove points with simple clicks on the graph

How It Works: ⚙️

The system continuously monitors weather conditions and calculates the perfect flow temperature by:

1️⃣ Reading your configured heating curve

2️⃣ Applying your manual corrections

3️⃣ Adding wind compensation (if enabled)

4️⃣ Automatically sending commands to your heat pump

Special for WiFi Adapter Users: 📡

Your heating curve is saved directly in the adapter, so it keeps working even if your internet connection drops.

Stay warm, stay efficient! 🏠💚

⚠️ Please note: This feature is currently in beta testing. We're actively gathering user feedback to improve and refine the experience. If you encounter any issues or have suggestions, please don't hesitate to reach out!

📧 Support Notice:

Due to the harsh winter conditions over the past month, we've been receiving an unusually high volume of support requests. Our team is working hard to assist everyone, but please note that email response times may be slightly extended, typically up to a few days. We appreciate your patience and understanding!

Smart Energy – Cheapest Period Settings

We’ve added new options for the cheapest period of the day. You can now reduce costs by heating your home or tank water more during the cheapest hours. This allows your heat pump to use low-cost energy when it’s available and limit consumption during expensive periods.

The pricing graph now also shows when cheap and expensive periods apply for today and tomorrow (green = cheap period, orange = expensive period).

More settings to the smart energy mode will be added later.