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It has been like that since it was built in the 60s as far as I can tell. So 65 years. And no doubt your point is that it hasn't fallen down yet. Which is a point well made.

Looks like I may have a roof design where the loft floor load is transferred to either a central vertical struts (a "king post"?) or two smaller vertical struts c. 3m in from the side walls ("queen posts"?). If so, then the 3"x2" joists can be treated as two separate 3.5m sections carrying only...

Another angle showing more of the surrounding roof structure down the centre-line.

I've attached two photos. One shows the pilot hole almost at the edge of the joist as evidenced by minor side wall breakout (see orange circled area). The second photo shows the general location, including water tank; the general joist locations are shown by the orange lines and the hole...

I’ve caught the edge of a roof joist with a pilot hole I drilled vertically up from the floor below. The hole is into the mid span of the roof joist around 3m in from each supporting wall (I think, I’ll need to check later). The hole is c. 15mm to 20mm deep and 2.5mm diameter. The joist is...

System appears to be running ok again. Central heating (but not hot water) Proportional control mode speed 3 22 W 3.8m head 0.7 m³/h I've run the heating just to heat the water in the hot water tank. The heating to the radiators was off. The pump provided the following data. Proportional...

Last night I switched to fixed speed control mode (speed 3) to try and get closer to the target 1 m³/h I think I need. The system had been running on proportional control (speed 3) for 3 or so hours before. The flowrate increased to 0.9 m³/h, but within an hour or so I experienced a pump trip. I...

I’ve got instantaneous system data for proportional control speed mode 2 and mode 3 from the Evosta 3 faceplate. Mode 2: Power: 8.1 W Head: 1.8 m Flowrate: 0.3 m³/h Mode 3: Power: 22 W Head: 3.8 m Flowrate: 0.7 m³/h Any thoughts on the data? I reckon I need 1 m³/h to deliver the 24 kW rated...

I replaced the British Gas Multihead G circulation pump with the DAB Evosta 3 at the weekend. The system is up and running. I’m waiting until the air is bled out before testing the different pump running profiles. I’ve attached photographs from the replacement, including the pipework and the...

What sort of head would you expect in a 4 bed detached house with 15 radiators?

I went ahead and ordered an Evosta 3 before I saw your latest reply. It's due to be delivered today. I did the test on the F&E cistern. I turned the central heating off and waited for the pump to stop. I then watched the cistern and turned the system on. There was no pumping over through the...

Thank you, I'll check the F&E at system switch on. Just curious on your pump recommendation, why did you recommend the DAB Evosta 3 over the Wilo yonos pico that you currently have?

Thank you for the advice Jon. The pump is installed in an awkward position. I’ll have a look at access to the pump head bolts. I may need to take it out either way for a look. The pump is in a noise sensitive area. I can't find noise ratings for either the evosta 3 or the wilo yonos pico. The...

I’ve turned down the flow temp by around a 1/4 on the boiler temp control knob tonight. There is no cavitation tonight. Of course the house is heating up even slower but at least it’s quieter.

The boiler seems to be firing constantly. 12kW is 50% turndown. Perhaps the boiler can run continuously at 50% load. The manual doesn’t give a max turndown.

Gravity hot water. Gas condensing boiler. 4 bed detached. Radiators balanced. System bled. House slow to heat. Low return temp to boiler. Pump intermittent cavitation. I would appreciate some advice on trouble shooting my central heating. It's slow to heat up and the pump is intermittently...