gas and electric use way above average

ajbird

MWT said:

Also fitted a simple programmable thermostat which allowed us to automatically change the temperature down to say 16C overnight, raise it to 19 for a couple of hours in the morning then down to 17C during the day when people are more active, then up to 20C for the evening.

We have a hive unit.. it is set to
21C in the morning and day
20C in evening
7C over night 

Most of the spring and summer it will simply be off (As it is now)

Water is only on for a few hours in morning a few hours at night
Boiler set to 45C

MWT

ajbird said:

MWT said:

Also fitted a simple programmable thermostat which allowed us to automatically change the temperature down to say 16C overnight, raise it to 19 for a couple of hours in the morning then down to 17C during the day when people are more active, then up to 20C for the evening.

We have a hive unit.. it is set to
21C in the morning and day
20C in evening
7C over night 

I'd suggest checking the flow temperature on the boiler and turning it down if it is set too high.

A lot of people seem to have them way too hot for the return flow temperature to drop low enough to let the boilers run in condensing mode (assuming yours has that mode).

... and maybe drop that day time setting down a bit, should need to be so high if people are active around the house. 

Do also check the radiators that are in the same space as the Hive thermostat as if they have a TRC set below the Hive setting it never reaches the set-point and just keep firing the boiler trying to get there...

Ally_E.

ajbird said:

MWT said:

Also fitted a simple programmable thermostat which allowed us to automatically change the temperature down to say 16C overnight, raise it to 19 for a couple of hours in the morning then down to 17C during the day when people are more active, then up to 20C for the evening.

We have a hive unit.. it is set to
21C in the morning and day
20C in evening
7C over night 

Most of the spring and summer it will simply be off (As it is now)

Water is only on for a few hours in morning a few hours at night
Boiler set to 45C

You mentioned 45C for the water tank, it's recommended to keep the tank at 55C to kill legionella bacteria, so set at boiler at 60-65C.

MWT

Ally_E. said:

ajbird said:

MWT said:

Also fitted a simple programmable thermostat which allowed us to automatically change the temperature down to say 16C overnight, raise it to 19 for a couple of hours in the morning then down to 17C during the day when people are more active, then up to 20C for the evening.

We have a hive unit.. it is set to
21C in the morning and day
20C in evening
7C over night 

Most of the spring and summer it will simply be off (As it is now)

Water is only on for a few hours in morning a few hours at night
Boiler set to 45C

You mentioned 45C for the water tank, it's recommended to keep the tank at 55C to kill legionella bacteria, so set at boiler at 60-65C.

The risks of legionella in an enclosed tank that is being frequently drained and refilled are somewhat overstated.

If it is a concern then raising the temperature once a week should be more than sufficient, certainly no need to run the boiler at 60-65C all the time.

ajbird

The risks of legionella in an enclosed tank that is being frequently drained and refilled are somewhat overstated.

If it is a concern then raising the temperature once a week should be more than sufficient, certainly no need to run the boiler at 60-65C all the time.

There are two settings here and I am not sure which we are referring to
THere is the dial on the tank (set to 45) and I have a min-max  dial on the boiler itself. (Worcester Bosch Greenstar 30Ri ) 
Which are we talking about ?

Ally_E.

MWT said:

Ally_E. said:

ajbird said:

MWT said:

Also fitted a simple programmable thermostat which allowed us to automatically change the temperature down to say 16C overnight, raise it to 19 for a couple of hours in the morning then down to 17C during the day when people are more active, then up to 20C for the evening.

We have a hive unit.. it is set to
21C in the morning and day
20C in evening
7C over night 

Most of the spring and summer it will simply be off (As it is now)

Water is only on for a few hours in morning a few hours at night
Boiler set to 45C

You mentioned 45C for the water tank, it's recommended to keep the tank at 55C to kill legionella bacteria, so set at boiler at 60-65C.

The risks of legionella in an enclosed tank that is being frequently drained and refilled are somewhat overstated.

If it is a concern then raising the temperature once a week should be more than sufficient, certainly no need to run the boiler at 60-65C all the time.

That's what I'm doing now, switching it on at 60C once a week. Otherwise 48C is a good temp for me.

Ally_E.

ajbird said:

The risks of legionella in an enclosed tank that is being frequently drained and refilled are somewhat overstated.

If it is a concern then raising the temperature once a week should be more than sufficient, certainly no need to run the boiler at 60-65C all the time.

There are two settings here and I am not sure which we are referring to
THere is the dial on the tank (set to 45) and I have a min-max  dial on the boiler itself. (Worcester Bosch Greenstar 30Ri ) 
Which are we talking about ?

Tank thermostat doesn't let it go above a certain temp for safety, can leave that at 60C. The boiler one is the one that controls the temperature of the water going to the tank. Is it in degrees or just numbers? I also have Worcester Bosch and for tank temp to be at 55C, I need to put it between 4 and E on the dial, on 4.75 if you will, closer to E than 4.

ajbird

The boiler just has a min - max setting 

k_man

Ally_E. said:

ajbird said:

The risks of legionella in an enclosed tank that is being frequently drained and refilled are somewhat overstated.

If it is a concern then raising the temperature once a week should be more than sufficient, certainly no need to run the boiler at 60-65C all the time.

There are two settings here and I am not sure which we are referring to
THere is the dial on the tank (set to 45) and I have a min-max  dial on the boiler itself. (Worcester Bosch Greenstar 30Ri ) 
Which are we talking about ?

Tank thermostat doesn't let it go above a certain temp for safety, can leave that at 60C. The boiler one is the one that controls the temperature of the water going to the tank. Is it in degrees or just numbers? I also have Worcester Bosch and for tank temp to be at 55C, I need to put it between 4 and E on the dial, on 4.75 if you will, closer to E than 4.

If you set the tank to higher than the boiler, doesn't that mean the boiler will be on for the duration of the timer, rather than stopping when the hot water has reached 45C, so running and pumping unnecessarily?

Ally_E.

k_man said:

Ally_E. said:

ajbird said:

The risks of legionella in an enclosed tank that is being frequently drained and refilled are somewhat overstated.

If it is a concern then raising the temperature once a week should be more than sufficient, certainly no need to run the boiler at 60-65C all the time.

There are two settings here and I am not sure which we are referring to
THere is the dial on the tank (set to 45) and I have a min-max  dial on the boiler itself. (Worcester Bosch Greenstar 30Ri ) 
Which are we talking about ?

Tank thermostat doesn't let it go above a certain temp for safety, can leave that at 60C. The boiler one is the one that controls the temperature of the water going to the tank. Is it in degrees or just numbers? I also have Worcester Bosch and for tank temp to be at 55C, I need to put it between 4 and E on the dial, on 4.75 if you will, closer to E than 4.

If you set the tank to higher than the boiler, doesn't that mean the boiler will be on for the duration of the timer, rather than stopping when the hot water has reached 45C, so running and pumping unnecessarily?

Good question. I don't know, maybe someone else can help?