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    Time control for night-rate/economy 7 tariff

    I am chairman of owners' committee for timeshare development of 11 apartments. All heating is electric night storage radiators and we are on a dual rate tariff. I've recently obtained half-hour meter reports from the electricity supplier and noticed a metering/billing anomaly. The night rate...
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    Electric heating

    I'm looking for some pointers on electric heating in an apartment block comprising 11 apartments constructed ~35 years ago. It is a 'shared ownership' development so has different occupants each week. Each apartment is two bedrooms (one en-suite) with living room/kitchen and a second bathroom...
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    Bell transformer queries

    I am planning to replace existing plain vanilla doorbell with a wired video doorbell. I want to retain the existing chime, which requires 8-16V AC supply. The video doorbell requires 16-24V and 10VA. Existing doorbell setup includes a Honeywell remote chime that specifies 8-12V supply. I...
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    Boiler cycling on and off

    Hi. I hope I can get some help with diagnosing a problem with my CH/DHW system. These are the facts. Boiler is a Potterton Suprima 80 (~ 20 years old but still in good condition) DHW is stored in Megaflo cylinder (unvented system) DHW is on a water circuit separate to two CH circuits serving...
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    Backup generator

    First of all, I hope readers will understand the reasons for the length of this post. I am seeking advice from professional sparkies, being qualified and experienced in ways that I am not, so I feel it necessary to provide a minimum amount of information to allow any comments and advice...
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    Boiler on time

    My heating system is controlled by Honeywell T6 programmable thermostats. Looking for input on the what 'minimum on time' to set. The default is (I think) 1 minute and the maximum is 5 minutes. Any comments on pros and cons on this question? The boiler is (2x) Potterton Suprima 80, about...
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    Seized stopcock

    I have a seized 22mm stopcock (stuck in open position) on the HW feed from a Megaflo cylinder to a bathroom. After trying (and failing) to shift it myself, it started leaking from the gland nut, so I called on my home emergency cover to get some professional help to see if a pro could (a) stop...
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    Is this a frost stat?

    The pic below shows a stat of some sort fitted to the flow pipe from my boiler. The electrical flex goes to a junction box where boiler controls enter/exit from boilers and various room or hot water stats. The system was fitted 20+ years ago. I've never been sure what the purposes of this...
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    Capping radiator valve

    I have removed a radiator that is (for now) unwanted/unused to free up the wall space. I have capped off the TRV with a maintenance cap and closed the lockshield (standard 15mm angle valves) but want to cap the rad side of the valves as well. I assume that I want one of these...
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    Help with diffuser removal

    Pics below are of light fitting in a rented flat that my daughter is using at uni, several hundred miles from me. The lamp needs replacing but she can't remove the cover/diffuser. It looks to me as though it just clips on and can be released by a tool/lever in the slot pictured, which she has...
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    CU needed for outbuilding

    I have built a small garden toilet ~2m away from the house. The builder has laid flexible ducting from an external power socket, that is fed from from an RCD protected CB on the main CU via a RFC, to teh inside of the building. I will want to run a light or two (LEDs) and a small 2kW water...
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    Unvented undersink water heater

    I want to provide H&C water to a small sink in a garden toilet. I have identified the Redring MS6 undersink unvented water heater and want to double-check my interpretation of manufacturer's instructions (MI) as to whether an expansion tank and associated fittings is mandated or can be omitted...
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    Earth rod for EV charger

    My house has TN-C-S earth system. My electrician recently installed a new 32A power supply on external garage wall to charge an EV. He drew my attention to a section of the 17th Edition regs, that he interpreted to mean that an additional earth rod was needed for the installation because...
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    Bathroom cabinet switching

    I've just had a bathroom mirror unit installed in a new bathroom. It has SELV lights downlights for the mirror (set in the top shelf) and under the bottom shelf. On inspecting the wiring arrangement, set in a recess in the top of the unit, I noticed that the 230v supply to the transformer has...
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    Baumatic BDW13 dishwasher

    Dishwasher as above (fully integrated) is causing RCD to trip ~5 mins into a wash cycle, which I suspect corresponds with water heater coming on. I have tried running on rinse cycle and no trip. Also got to element connection from below (by removing kitchen plinth and d/w inspection panels...
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    Potterton Powermax 115 - no heating or DHW

    Need some help diagnosing problem with this installation in a two bed flat. Condensing/combi boiler with internal stored hot water. Have had no problems up till now although have been away over summer for 6 weeks. All indicators (lights, water pressure) on the boiler appear normal/okay...
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    Wireless network

    My sons complain that wireless network signal for the PS3 in basement room (router is in the study on ground floor) keeps dropping off. They say it's my gateway/router, which admittedly is quite old. But I don't want to replace it until I'm sure it will improve matters. Alternative I'm...
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    Shower mixer

    This is a shower valve that I think has faulty cartridge (water doesn't run hot). Can someone say what type/make of valve this is; whether replacement catridge will be available; and explain how I can get into the valve to remove the cartridge. TIA.
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    Merc E320 CDi - battery/electrics

    1. Last February was getting "Electrical consumers switched off" warning on first start after a cold night (which indicated low battery charge). Car was on Merc maintenenace contract and eventually persuaded the service agent (Merce dealer) to supply new battery. So battery is ~6 months old...
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    Aircraft and conveyor belt (again)

    I was very interested in the recent (now locked) thread on the 777 incident that re-opened the debate on the jet plane on conveyor belt problem. Congratulations to a number of posters who gave very clear explanations and illustrations of the correct answer - being, of course, that the aircraft...
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