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Ecodan consuming 100kwh per day in new build!!!

anca1808 · 2025-02-20T19:34:23Z

Hello, I am super desperate so please if anyone heat pump savvy could help!!! I just bought my first home. It has an Ecodan Mitsubishi heat pump. In 4 days that we have been in ...using just the kettle and trying to get heating to around 22 degrees ( as we have a small baby) we have used 400kwh! my setup is downstairs underfloor heating with 4 termostats ( set at 21) ( zone 1) 4 double bedroom upstairs with radiators one termostat ( set at 20) ( zone 2) . I am of medical background so barely understood anything about heat pumps. I have desperately read so much about heat pumps in last 48h but still have no clue how to optimise efficiency. I have asked developer to help. they sent a plumber out and he just reset stuff but not much help as this did nothing to the energy consume...i am still down 60kwh from 1 pm til 10pm currently... Downstairs ok temperature wise ( reaches 21, but i am scared to push it more due to consume), but upstairs nothing happens even if we put to 22 the termostat our desired temp. we stopped it because we are scared that something is not right as radiators barely get warm, temperature is actually 19.5 when i put it to 22 and i think heat pump is running non stop unefficiently. Anyway, my COP is around 2 i think ( consumes 800kwh and produces 1600kwh....i hope that is how it is calculated).I have no wifi yet as just moved in and cant connect to melcloud to download more data, but something is clearly wrong as house is cold and i am consuming 100kwh with nothing on inside . Currently sleeping with baby on couch in livingroom as bedroom is far too cold at 18 degrees during night. If anyone could help please with somesort of guide of what settings should i use or what could be wrong .... Oh house is B ( 85) EPC rating . Ps . I called mitsubishi and to send an engineer out takes a few weeks. by that time my bills will be the size of my mortgage so i am really panicked.....

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Air Source Heat Pumps (ASHPs)

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JamesPa

(@jamespa)

Illustrious Member Moderator

Joined: 3 years ago

Posts: 5269

12/07/2025 8:42 am

This particular example is one of the worst I have seen here. Uninsulated buried primaries!, uninsulated pipework around the cylinder, system separation, oversized heat pump, undersized radiators and doubtless some things we don't know about because they are masked.

The plumber who 'installed' this should be struck off! It's almost like they designed it not to work, but I doubt they were that competent. The lack of insulation would be equally bad if this were a boiler installation (worse in the case if the dhw tank, because it would be heated to a higher temperature), how were they ever let near this job. It makes one wonder about the rest of the plumbing.

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

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