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Johnmo
@johnmo
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Joined: Jan 25, 2023
Last seen: May 20, 2025
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About Me

Mechanical (Rotating Equipment) Engineer by trade. 

Took a few years off to build my own house, wasn't getting what I wanted from builders so chose to actually build myself. Ended with a low energy input house and have learnt a lot on the way.

Key finding - when you start doing low flow temperature heating systems (gas or heat pump) the norms and convention do not apply and fights against you. Low temp heating systems require a higher flow rate, anything that hinders that, gets in the way.

Started with a thermostat in every room, actuator on every UFH loop, UFH mixing valve and pump. Then added a two port buffer to help, changed mixing valve on UFH to help cope. Nothing really made a difference until I simplified.

Then the light bulb moment - everything not required (thermostats, actuators, mixing valves, additional pumps, buffer) were all removed. If I had known at the start would have saved loads of money on parts and unnecessarily high heating bills. Over two heating seasons halved gas bill. Then installed ASHP, battery and more PV and reduced by a 1/3 again.

Location

United Kingdom

Timezone

UTC+0

Occupation

Consulting Engineer (Rotating Equipment)

Signature

Maxa i32V5 6kW ASHP (heat and cooling)
6.5kW PV
13.5kW GivEnergy AIO Battery.

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