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When changing a couple of radiators what would be the best approach to system cleaning? Products like X300 state not recommended for systems older than 6 months, but obviously the new radiators will have manufacturing oils etc, need passivation, and flux in system need flushing.

Just had a Sentinel test back reporting ph8.8, and possible aluminium corrosion (recommended <ph8.5). System contains some new radiators including aluminium. Internet seems mixed on whether aluminium oxide is stable to ph8, 8.5, or 9. Any thoughts on whether drain and clean is really needed...

Hi, I have a Vaillant HP with 17 rads on a single circuit. Building has 3 thermal zones - house, office and workshop; sun impacts house in the morning. Currently controlled with Wiser, which works fine, but bad for the heat pump efficiency. Considering replacing Wiser with AmbiSense starter...

Anyone know anything about this? I'm looking to rip out the central heating system in our house (1920's 3-bed) and install a decent air conditioning and heat pump system. Firstly, that leaves me with no hot water. Is it OK to have a combi to doing mainly hot water (on mains pressure) and...

Recently had consumer unit replaced with MK sentry job, split load. Downstairs light circuit suddendly stopped working BUT the breaker hadn't tripped. Initially thought the breaker might have died but is working OK. So inspected the connections in the consumer unit, no probs, and the...

Model is WVF 2501, washer dryer, about 2yrs old. Seems to work OK but won't dry - doesn't seem to be any heat. What I presume to be the air heater element on top of the drum just after the fan is still showing 35-ohms across it though. Any ideas greatly appreciated!!