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Our heating system is working perfectly, except that the Vaillant boiler has to modulate right down when only the underfloor heating manifold is being supplied. It needs water at 35°.This means the boiler is on for ages. It is annoyingly loud even at the minimum 4kW. I have suggested a revised...

I googled for: ceme 1.021715 and got this: https://www.247boilerparts.co.uk/alpha-3014379-1021715-low-water-pressure-switch-675-p.asp

We have a Vent Axia unit which is very similar and have lived in this house since it was built in 2012. Initially I had similar concerns to you - but not now. The moist air is sucked up as you said but then expelled through the vents to the outside. It passes through a heat exchanger where it...

Here's a copy of page 21

Have a look at page 21.....

According to REHAU, the balancing and flow adjustment is done by turning the square headed screws under the thermoheads, not by turning the flow meters - see screenshot attached (which shows the manifold before the thermoheads are fitted.)

If you don't cook with gas you could have the gas cut off and save the standing charge, ie total gas account cost = £ 0 Roddy

Ours is water based ufh with a manifold with 10 circuits. The actuators on the manifold are wired to an OJ control box - circled in the photo. Roddy

Our thermostats were made by OJ about 2010 and branded Rehau. They are a different style to yours but I suspect OJ use the same sort of mounting arrangement. The middle part simply pulls outwards - it's held in by friction. There is no latch to release or screw, etc. Of course I can't guarantee...

I mean we have OJ controls in our house. Sorry about my ambiguity. Your reply from OJ does suggest it will be difficult to find replacements.

Hello, We have OJ thermostats and controls. They simply pull out and off their backplate - but they are quite stiff. Here is a link to OJ: https://ojelectronics.com/floorheating/products/on-off-thermostat-mtu2/ Googling suggests they may still be available in Europe.

Free standing heaters like these produce exhaust gases which must be allowed to escape by ventilation - which also allows your nicely heated air to escape. This is, in my opinion, a pretty poor arrangement, suitable only for very localised heating in a large workshop for example. Using one in a...

We have an unvented system with expansion vessel. When the diaphragm died in the EV, exactly the kind of smeary, oily drops appeared - and were first noticed in the bath water.

Start 10°, end 60°

Approx 0.071kWh which at about 10p per kWh = approx 0.7p

We had a similar issue with our new Vaillant boiler which was a direct replacement for an older boiler which developed a leak in the heat exchanger. We also have a Gledhill tank. The noise was so bad I could feel it in the pipes and also on the boiler case. I was reluctant to leave the house...

Brown water from hot taps could be related to the expansion vessel if a pressurised system. Check if water comes out of the air top up valve.

That's interesting, Ian, does that mean it can be upset by gusts of wind hitting it head on?

There is only UFH. The noise is the same when only the tank is being heated without the UFH being on. Is it a coincidence that it has done this a few times today, the first day with blustery wind hitting the gable where the balanced flue exits?

Can anyone identify the source of an intermittent loud droning noise from our Vaillant EcoTec Plus 612 boiler? Vaillant’s engineer came out but it didn’t happen that day! He did check the boiler through and found no faults. Before I ask a local repair man to have a look, I wonder if any of you...