Best way to get hot water in summer - gas or electric?

[Mr Punter]

We have a gas system boiler and an unvented cylinder. The boiler is on level 4 and the cylinder is on level 1.  Bathrooms are on levels 1 and 2.

 

We have the water timed to heat up via the boiler for 1 hour twice a day.

 

Because the plumber did not insulated the primary pipework well,  the TV room on level 2, where the pipework runs across the floor, gets uncomfortably hot so we have to open the balcony door.

 

Would I be better off just using the immersion on a timer in summer, and if so should I also look at economy 7?

[ragg987]

Electric will contain the heat to the DHW so better in that sense, but even with economy 7 will cost at least double against gas. Plus your day time electricity use will be more expensive.

 

Could you limit the boiler hours by a timer e.g. first thing in morning when TV room not in use, then switch it off for rest of the day?

[SteamyTea]

I use E7 with an additional timer that limits the E7 window to the last 3 hours i.e. 4AM to 7AM.  This helps limit standing losses during the night and gives me enough DHW for a day.

I use about 3 kWh/day for DHW.  So about 30 pence worth.

My water and sewage costs me about 50p.

Edited June 9, 2019 by SteamyTea