My Viessman boiler journey

[Oz07]

3 minutes ago, JohnMo said:

I've just simplified and started to do DHW direct via immersion only. Left all the piping valves etc in place so could revert later, if I wanted, but over the last 3 weeks haven't been shocked by electric usage.

Sounds good what made you do this is it quicker recharge than ashp?

[marshian]

12 minutes ago, JohnMo said:

I've just simplified and started to do DHW direct via immersion only. Left all the piping valves etc in place so could revert later, if I wanted, but over the last 3 weeks haven't been shocked by electric usage.

 

Current winter daily average HW heating is 4.5 kWh at £0.052 per kWh

 

No solar, no battery and std fixed electricity rate at £0.26 per kWh - be a big increase in cost to heat direct via immersion only 

 

We only ever heat direct in summer during heating system improvements (have some more planned for 2026)

[JohnMo]

1 hour ago, Oz07 said:

Sounds good what made you do this is it quicker recharge than ashp?

Mostly a long run of piping, although getting what looks a good CoP, generally 3+ it wasn't really that good, as we got a big slug of cold water hit the cylinder coil and it cooled the vessel. So small recharge needed to add a disproportionate of energy.

 

So will just leave heat pump to tick away, doing heating and cooling. 

[Oz07]

7 hours ago, JohnMo said:

Mostly a long run of piping, although getting what looks a good CoP, generally 3+ it wasn't really that good, as we got a big slug of cold water hit the cylinder coil and it cooled the vessel. So small recharge needed to add a disproportionate of energy.

 

So will just leave heat pump to tick away, doing heating and cooling. 

Atleast you've always got a back up if the immersion fail.